Available at https://riidefi.github.io/RiiStudio/

Importing

DAE, FBX and OBJ files can be imported as either BMD or BRRES models. Simply drag one onto the window.
Transparent textures are automatically configured.
High-quality mipmaps are automatically generated.
Various optimizations: Duplicate material merging, bone collapsing, automatic correction of flipped normals.

Experimental support for BRRES saving.
- Files with more than one bone cannot be saved, yet. (That means no models imported with BrawlBox)
- If you encounter any issues, let me know. I'm working on a comprehensive test suite. Ideally, the tool will be able to rebuild every Nintendo file we have with 1:1 accuracy.
KMP files can be read and rebuilt. Editing is only proof-of-concept. Code for U8 and SZS have been added, although they are not hooked up to the frontend yet.

TEV stages can now be removed by closing their respective tabs.
Importer warnings are now displayed to the user.
Various usability improvements to Headers mode in the Property Editor.
Before, using a slider would pollute the history list with intermediate states. Now, history entries are only recorded when the mouse button is released.
Pressing CTRL in the viewport previously locked the mouse in a hidden state. This was confusing, so it was removed.
Improved selection logic to be more standard. Before, selection was local to each folder. Now, only one selection may exist in an editor; selecting a texture while a material is already selected will clear the prior selection.
Changed the default theme
Embedded the theme editor in the main toolbar

Fixed a bug where altering the the Alpha Comparison settings in a material would not update the preview.
Fixed a bug where unused mip levels would not be read.
Fixed a crash when models used two vertex color channels.
Fixed a bug where updating N materials caused N^2 shader recompilations.
Various stability and performance improvements