diff --git a/src/NexusMods.App.UI/Controls/ReactiveR3Object.cs b/src/NexusMods.App.UI/Controls/ReactiveR3Object.cs
index 5a918ab162..3297b0b592 100644
--- a/src/NexusMods.App.UI/Controls/ReactiveR3Object.cs
+++ b/src/NexusMods.App.UI/Controls/ReactiveR3Object.cs
@@ -5,18 +5,26 @@
 
 namespace NexusMods.App.UI.Controls;
 
+[PublicAPI]
+public interface IReactiveR3Object : ReactiveUI.IReactiveObject, IDisposable
+{
+    Observable<bool> Activation { get; }
+    void Activate();
+    void Deactivate();
+}
+
 /// <summary>
 /// Base class using R3 with support for activation/deactivation,
 /// <see cref="INotifyPropertyChanged"/>, and <see cref="INotifyPropertyChanging"/>.
 /// </summary>
 [PublicAPI]
-public class ReactiveR3Object : ReactiveUI.IReactiveObject, IDisposable
+public class ReactiveR3Object : IReactiveR3Object
 {
     private readonly BehaviorSubject<bool> _activation = new(initialValue: false);
     public Observable<bool> Activation => _activation;
 
-    internal void Activate() => _activation.OnNext(true);
-    internal void Deactivate()
+    public void Activate() => _activation.OnNext(true);
+    public void Deactivate()
     {
         // NOTE(erri120): no need to deactivate disposed objects, as
         // any subscriptions and WhenActivated-blocks are already disposed
diff --git a/src/NexusMods.App.UI/Controls/TreeDataGrid/IColumnDefinition.cs b/src/NexusMods.App.UI/Controls/TreeDataGrid/IColumnDefinition.cs
new file mode 100644
index 0000000000..55a7358df1
--- /dev/null
+++ b/src/NexusMods.App.UI/Controls/TreeDataGrid/IColumnDefinition.cs
@@ -0,0 +1,70 @@
+using Avalonia.Controls.Models.TreeDataGrid;
+using JetBrains.Annotations;
+
+namespace NexusMods.App.UI.Controls;
+
+/// <summary>
+/// Static interface for column definitions
+/// </summary>
+[PublicAPI]
+public interface IColumnDefinition<TModel, TSelf>
+    where TModel : class
+    where TSelf : IColumnDefinition<TModel, TSelf>, IComparable<TSelf>
+{
+    static virtual int Compare(TModel? a, TModel? b)
+    {
+        return (a, b) switch
+        {
+            (TSelf itemA, TSelf itemB) => itemA.CompareTo(itemB),
+
+            // b precedes a
+            (TSelf, _) => 1,
+
+            // a precedes b
+            (_, TSelf) => -1,
+
+            // a and b are in the same position
+            (_, _) => 0,
+        };
+    }
+
+    static abstract string GetColumnHeader();
+    static abstract string GetColumnTemplateResourceKey();
+    static virtual string GetColumnId() => TSelf.GetColumnTemplateResourceKey();
+
+    static virtual IColumn<TModel> CreateColumn()
+    {
+        return new CustomTemplateColumn<TModel>(
+            header: TSelf.GetColumnHeader(),
+            cellTemplateResourceKey: TSelf.GetColumnTemplateResourceKey(),
+            options: new TemplateColumnOptions<TModel>
+            {
+                CanUserSortColumn = true,
+                CanUserResizeColumn = true,
+                CompareAscending = static (a, b) => TSelf.Compare(a, b),
+                CompareDescending = static (a, b) => TSelf.Compare(b, a),
+            }
+        )
+        {
+            Id = TSelf.GetColumnId(),
+        };
+    }
+}
+
+/// <summary>
+/// Column helper.
+/// </summary>
+[PublicAPI]
+public static class ColumnCreator
+{
+    /// <summary>
+    /// Creates a column from a static interface definition.
+    /// </summary>
+    public static IColumn<TModel> CreateColumn<TModel, TColumnInterface>()
+        where TModel : class
+        where TColumnInterface : IColumnDefinition<TModel, TColumnInterface>, IComparable<TColumnInterface>
+    {
+        return TColumnInterface.CreateColumn();
+    }
+}
+
diff --git a/src/NexusMods.App.UI/Controls/TreeDataGrid/TreeDataGridItemModel.cs b/src/NexusMods.App.UI/Controls/TreeDataGrid/TreeDataGridItemModel.cs
index d7e39f26fb..acb8f18304 100644
--- a/src/NexusMods.App.UI/Controls/TreeDataGrid/TreeDataGridItemModel.cs
+++ b/src/NexusMods.App.UI/Controls/TreeDataGrid/TreeDataGridItemModel.cs
@@ -9,10 +9,13 @@
 
 namespace NexusMods.App.UI.Controls;
 
+[PublicAPI]
+public interface ITreeDataGridItemModel : IReactiveR3Object;
+
 /// <summary>
 /// Base class for models of <see cref="Avalonia.Controls.TreeDataGrid"/> items.
 /// </summary>
-public class TreeDataGridItemModel : ReactiveR3Object;
+public class TreeDataGridItemModel : ReactiveR3Object, ITreeDataGridItemModel;
 
 /// <summary>
 /// Generic variant of <see cref="TreeDataGridItemModel"/>.
@@ -145,7 +148,7 @@ protected override void Dispose(bool disposing)
     }
 
     [MustDisposeResource] protected static IDisposable WhenModelActivated<TItemModel>(TItemModel model, Action<TItemModel, CompositeDisposable> block)
-        where TItemModel : TreeDataGridItemModel
+        where TItemModel : ITreeDataGridItemModel
     {
         return model.WhenActivated(block);
     }
diff --git a/src/NexusMods.App.UI/Extensions/R3Extensions.cs b/src/NexusMods.App.UI/Extensions/R3Extensions.cs
index b308b77b04..d2d2f07fdc 100644
--- a/src/NexusMods.App.UI/Extensions/R3Extensions.cs
+++ b/src/NexusMods.App.UI/Extensions/R3Extensions.cs
@@ -15,7 +15,7 @@ public static class R3Extensions
     [MustDisposeResource] public static IDisposable WhenActivated<T>(
         this T obj,
         Action<T, CompositeDisposable> block)
-        where T : ReactiveR3Object
+        where T : IReactiveR3Object
     {
         var d = Disposable.CreateBuilder();
 
diff --git a/src/NexusMods.App.UI/NexusMods.App.UI.csproj b/src/NexusMods.App.UI/NexusMods.App.UI.csproj
index 08f935af34..10b6f3cfd0 100644
--- a/src/NexusMods.App.UI/NexusMods.App.UI.csproj
+++ b/src/NexusMods.App.UI/NexusMods.App.UI.csproj
@@ -650,6 +650,24 @@
         <Compile Update="Pages\LibraryPage\Collections\CollectionCardViewModel.cs">
           <DependentUpon>ICollectionCardViewModel.cs</DependentUpon>
         </Compile>
+        <Compile Update="Pages\LibraryPage\ILibraryItemWithName.cs">
+            <DependentUpon>ILibraryItemModel.cs</DependentUpon>
+        </Compile>
+        <Compile Update="Pages\LibraryPage\ILibraryItemWithVersion.cs">
+            <DependentUpon>ILibraryItemModel.cs</DependentUpon>
+        </Compile>
+        <Compile Update="Pages\LibraryPage\ILibraryItemWithSize.cs">
+            <DependentUpon>ILibraryItemModel.cs</DependentUpon>
+        </Compile>
+        <Compile Update="Pages\LibraryPage\ILibraryItemWithDownloadedDate.cs">
+            <DependentUpon>ILibraryItemModel.cs</DependentUpon>
+        </Compile>
+        <Compile Update="Pages\LibraryPage\ILibraryItemWithInstalledDate.cs">
+            <DependentUpon>ILibraryItemModel.cs</DependentUpon>
+        </Compile>
+        <Compile Update="Pages\LibraryPage\ILibraryItemWithAction.cs">
+            <DependentUpon>ILibraryItemModel.cs</DependentUpon>
+        </Compile>
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemModel.cs b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemModel.cs
new file mode 100644
index 0000000000..e6f347190e
--- /dev/null
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemModel.cs
@@ -0,0 +1,5 @@
+using NexusMods.App.UI.Controls;
+
+namespace NexusMods.App.UI.Pages.LibraryPage;
+
+public interface ILibraryItemModel : ITreeDataGridItemModel;
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithAction.cs b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithAction.cs
new file mode 100644
index 0000000000..16cd32e8bb
--- /dev/null
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithAction.cs
@@ -0,0 +1,35 @@
+using NexusMods.App.UI.Controls;
+using R3;
+
+namespace NexusMods.App.UI.Pages.LibraryPage;
+
+public interface ILibraryItemWithAction : ILibraryItemModel, IComparable<ILibraryItemWithAction>, IColumnDefinition<ILibraryItemModel, ILibraryItemWithAction>
+{
+    int IComparable<ILibraryItemWithAction>.CompareTo(ILibraryItemWithAction? other)
+    {
+        return (this, other) switch
+        {
+            (ILibraryItemWithInstallAction, ILibraryItemWithDownloadAction) => -1,
+            (ILibraryItemWithDownloadAction, ILibraryItemWithInstallAction) => 1,
+            _ => 0,
+        };
+    }
+
+    public const string ColumnTemplateResourceKey = "LibraryItemActionColumn";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithAction>.GetColumnHeader() => "Action";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithAction>.GetColumnTemplateResourceKey() => ColumnTemplateResourceKey;
+}
+
+public interface ILibraryItemWithInstallAction : ILibraryItemWithAction
+{
+    ReactiveCommand<Unit, Unit> InstallItemCommand { get; }
+
+    BindableReactiveProperty<bool> IsInstalled { get; }
+
+    BindableReactiveProperty<string> InstallButtonText { get; }
+}
+
+public interface ILibraryItemWithDownloadAction : ILibraryItemWithAction
+{
+    ReactiveCommand<Unit, Unit> DownloadItemCommand { get; }
+}
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithDownloadedDate.cs b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithDownloadedDate.cs
new file mode 100644
index 0000000000..b1a7ca9b1c
--- /dev/null
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithDownloadedDate.cs
@@ -0,0 +1,16 @@
+using NexusMods.App.UI.Controls;
+using R3;
+
+namespace NexusMods.App.UI.Pages.LibraryPage;
+
+public interface ILibraryItemWithDownloadedDate : ILibraryItemModel, IComparable<ILibraryItemWithDownloadedDate>, IColumnDefinition<ILibraryItemModel, ILibraryItemWithDownloadedDate>
+{
+    ReactiveProperty<DateTime> DownloadedDate { get; }
+    BindableReactiveProperty<string> FormattedDownloadedDate { get; }
+
+    int IComparable<ILibraryItemWithDownloadedDate>.CompareTo(ILibraryItemWithDownloadedDate? other) => other is null ? 1 : DateTime.Compare(DownloadedDate.Value, other.DownloadedDate.Value);
+
+    public const string ColumnTemplateResourceKey = "LibraryItemDownloadedDateColumn";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithDownloadedDate>.GetColumnHeader() => "Downloaded";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithDownloadedDate>.GetColumnTemplateResourceKey() => ColumnTemplateResourceKey;
+}
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithInstalledDate.cs b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithInstalledDate.cs
new file mode 100644
index 0000000000..9f4fa3d648
--- /dev/null
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithInstalledDate.cs
@@ -0,0 +1,16 @@
+using NexusMods.App.UI.Controls;
+using R3;
+
+namespace NexusMods.App.UI.Pages.LibraryPage;
+
+public interface ILibraryItemWithInstalledDate : ILibraryItemModel, IComparable<ILibraryItemWithInstalledDate>, IColumnDefinition<ILibraryItemModel, ILibraryItemWithInstalledDate>
+{
+    ReactiveProperty<DateTime> InstalledDate { get; }
+    BindableReactiveProperty<string> FormattedInstalledDate { get; }
+
+    int IComparable<ILibraryItemWithInstalledDate>.CompareTo(ILibraryItemWithInstalledDate? other) => other is null ? 1 : DateTime.Compare(InstalledDate.Value, other.InstalledDate.Value);
+
+    public const string ColumnTemplateResourceKey = "LibraryItemInstalledDateColumn";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithInstalledDate>.GetColumnHeader() => "Installed";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithInstalledDate>.GetColumnTemplateResourceKey() => ColumnTemplateResourceKey;
+}
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithName.cs b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithName.cs
new file mode 100644
index 0000000000..73d5359131
--- /dev/null
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithName.cs
@@ -0,0 +1,15 @@
+using NexusMods.App.UI.Controls;
+using R3;
+
+namespace NexusMods.App.UI.Pages.LibraryPage;
+
+public interface ILibraryItemWithName : ILibraryItemModel, IComparable<ILibraryItemWithName>, IColumnDefinition<ILibraryItemModel, ILibraryItemWithName>
+{
+    BindableReactiveProperty<string> Name { get; }
+
+    int IComparable<ILibraryItemWithName>.CompareTo(ILibraryItemWithName? other) => string.CompareOrdinal(Name.Value, other?.Name.Value);
+
+    public const string ColumnTemplateResourceKey = "LibraryItemNameColumn";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithName>.GetColumnHeader() => "Name";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithName>.GetColumnTemplateResourceKey() => ColumnTemplateResourceKey;
+}
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithSize.cs b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithSize.cs
new file mode 100644
index 0000000000..8349be6166
--- /dev/null
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithSize.cs
@@ -0,0 +1,17 @@
+using NexusMods.App.UI.Controls;
+using NexusMods.Paths;
+using R3;
+
+namespace NexusMods.App.UI.Pages.LibraryPage;
+
+public interface ILibraryItemWithSize : ILibraryItemModel, IComparable<ILibraryItemWithSize>, IColumnDefinition<ILibraryItemModel, ILibraryItemWithSize>
+{
+    ReactiveProperty<Size> ItemSize { get; }
+    BindableReactiveProperty<string> FormattedSize { get; }
+
+    int IComparable<ILibraryItemWithSize>.CompareTo(ILibraryItemWithSize? other) => other is null ? 1 : ItemSize.Value.CompareTo(other.ItemSize.Value);
+
+    public const string ColumnTemplateResourceKey = "LibraryItemSizeColumn";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithSize>.GetColumnHeader() => "Size";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithSize>.GetColumnTemplateResourceKey() => ColumnTemplateResourceKey;
+}
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithVersion.cs b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithVersion.cs
new file mode 100644
index 0000000000..18994bb203
--- /dev/null
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/ILibraryItemWithVersion.cs
@@ -0,0 +1,15 @@
+using NexusMods.App.UI.Controls;
+using R3;
+
+namespace NexusMods.App.UI.Pages.LibraryPage;
+
+public interface ILibraryItemWithVersion : ILibraryItemModel, IComparable<ILibraryItemWithVersion>, IColumnDefinition<ILibraryItemModel, ILibraryItemWithVersion>
+{
+    BindableReactiveProperty<string> Version { get; }
+
+    int IComparable<ILibraryItemWithVersion>.CompareTo(ILibraryItemWithVersion? other) => string.CompareOrdinal(Version.Value, other?.Version.Value);
+
+    public const string ColumnTemplateResourceKey = "LibraryItemVersionColumn";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithVersion>.GetColumnHeader() => "Version";
+    static string IColumnDefinition<ILibraryItemModel, ILibraryItemWithVersion>.GetColumnTemplateResourceKey() => ColumnTemplateResourceKey;
+}
diff --git a/src/NexusMods.App.UI/Pages/LibraryPage/LibraryView.axaml b/src/NexusMods.App.UI/Pages/LibraryPage/LibraryView.axaml
index 063f80c8e9..c1569ca64d 100644
--- a/src/NexusMods.App.UI/Pages/LibraryPage/LibraryView.axaml
+++ b/src/NexusMods.App.UI/Pages/LibraryPage/LibraryView.axaml
@@ -96,6 +96,123 @@
                               Classes="MainListsStyling"
                               HorizontalAlignment="Stretch">
                     <TreeDataGrid.Resources>
+                        <!-- Name column -->
+                        <DataTemplate x:Key="{x:Static local:ILibraryItemWithName.ColumnTemplateResourceKey}" DataType="local:ILibraryItemModel">
+                            <ContentControl Content="{CompiledBinding}">
+                                <ContentControl.DataTemplates>
+                                    <!-- with name -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemWithName}">
+                                        <TextBlock Text="{CompiledBinding Name.Value}"/>
+                                    </DataTemplate>
+
+                                    <!-- fallback -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemModel}">
+                                        <TextBlock Text="-"/>
+                                    </DataTemplate>
+                                </ContentControl.DataTemplates>
+                            </ContentControl>
+                        </DataTemplate>
+
+                        <!-- Version column -->
+                        <DataTemplate x:Key="{x:Static local:ILibraryItemWithVersion.ColumnTemplateResourceKey}" DataType="local:ILibraryItemModel">
+                            <ContentControl Content="{CompiledBinding}">
+                                <ContentControl.DataTemplates>
+                                    <!-- with version -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemWithVersion}">
+                                        <TextBlock Text="{CompiledBinding Version.Value}"/>
+                                    </DataTemplate>
+
+                                    <!-- fallback -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemModel}">
+                                        <TextBlock Text="-"/>
+                                    </DataTemplate>
+                                </ContentControl.DataTemplates>
+                            </ContentControl>
+                        </DataTemplate>
+
+                        <!-- Size column -->
+                        <DataTemplate x:Key="{x:Static local:ILibraryItemWithSize.ColumnTemplateResourceKey}" DataType="local:ILibraryItemModel">
+                            <ContentControl Content="{CompiledBinding}">
+                                <ContentControl.DataTemplates>
+                                    <!-- with size -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemWithSize}">
+                                        <TextBlock Text="{CompiledBinding FormattedSize.Value}"/>
+                                    </DataTemplate>
+
+                                    <!-- fallback -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemModel}">
+                                        <TextBlock Text="-"/>
+                                    </DataTemplate>
+                                </ContentControl.DataTemplates>
+                            </ContentControl>
+                        </DataTemplate>
+
+                        <!-- Downloaded Date column -->
+                        <DataTemplate x:Key="{x:Static local:ILibraryItemWithDownloadedDate.ColumnTemplateResourceKey}" DataType="local:ILibraryItemModel">
+                            <ContentControl Content="{CompiledBinding}">
+                                <ContentControl.DataTemplates>
+                                    <!-- with downloaded date -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemWithDownloadedDate}">
+                                        <TextBlock Text="{CompiledBinding FormattedDownloadedDate.Value}"/>
+                                    </DataTemplate>
+
+                                    <!-- fallback -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemModel}">
+                                        <TextBlock Text="-"/>
+                                    </DataTemplate>
+                                </ContentControl.DataTemplates>
+                            </ContentControl>
+                        </DataTemplate>
+
+                        <!-- Installed Date column -->
+                        <DataTemplate x:Key="{x:Static local:ILibraryItemWithInstalledDate.ColumnTemplateResourceKey}" DataType="local:ILibraryItemModel">
+                            <ContentControl Content="{CompiledBinding}">
+                                <ContentControl.DataTemplates>
+                                    <!-- with installed date -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemWithInstalledDate}">
+                                        <TextBlock Text="{CompiledBinding FormattedInstalledDate.Value}"/>
+                                    </DataTemplate>
+
+                                    <!-- fallback -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemModel}">
+                                        <TextBlock Text="-"/>
+                                    </DataTemplate>
+                                </ContentControl.DataTemplates>
+                            </ContentControl>
+                        </DataTemplate>
+
+                        <!-- Action column -->
+                        <DataTemplate x:Key="{x:Static local:ILibraryItemWithAction.ColumnTemplateResourceKey}" DataType="local:ILibraryItemModel">
+                            <ContentControl Content="{CompiledBinding}">
+                                <ContentControl.DataTemplates>
+                                    <!-- Install action -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemWithInstallAction}">
+                                        <Button Command="{CompiledBinding InstallItemCommand}"
+                                                Classes="Standard"
+                                                Classes.Primary="{CompiledBinding !IsInstalled.Value}"
+                                                Classes.Tertiary="{CompiledBinding IsInstalled.Value}"
+                                                HorizontalAlignment="Center">
+                                            <StackPanel Orientation="Horizontal">
+                                                <icons:UnifiedIcon Value="{x:Static icons:IconValues.Check}" IsVisible="{CompiledBinding IsInstalled.Value}" />
+                                                <TextBlock Text="{CompiledBinding InstallButtonText.Value}" />
+                                            </StackPanel>
+                                        </Button>
+                                    </DataTemplate>
+
+                                    <!-- Download action -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemWithDownloadAction}">
+                                        <Button Command="{CompiledBinding DownloadItemCommand}">
+                                            <TextBlock Text="Download"/>
+                                        </Button>
+                                    </DataTemplate>
+
+                                    <!-- fallback -->
+                                    <DataTemplate DataType="{x:Type local:ILibraryItemModel}"/>
+                                </ContentControl.DataTemplates>
+                            </ContentControl>
+                        </DataTemplate>
+
+                        <!-- TODO: To be deleted -->
                         <DataTemplate x:Key="InstallColumnTemplate" DataType="local:LibraryItemModel">
                             <Button Command="{CompiledBinding InstallCommand}" 
                                     Classes="Standard"