diff --git a/.github/actions/netbsd-vm/action.yml b/.github/actions/netbsd-vm/action.yml
new file mode 100644
index 00000000..aedd80a7
--- /dev/null
+++ b/.github/actions/netbsd-vm/action.yml
@@ -0,0 +1,50 @@
+name: 'NetBSD VM'
+description: 'Install NetBSD VM with python3, PDM and tox pre-installed'
+inputs:
+  python-version:
+    description: "Version range or exact version of Python to use, using SemVer's version range syntax."
+    required: true
+  run:
+    description: 'The CI command to run'
+    required: true
+  release:
+    description: 'The release version of NetBSD vm'
+    required: false
+  envs:
+    description: 'The envs to pass into NetBSD vm'
+    required: false
+  sync:
+    description: 'How to synchronize the source code to/from the VM, Values can be:  rsync(default), and sshfs'
+    required: false
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Load PDM configuration from pdm.conf
+      uses: cardinalby/export-env-action@v2
+      with:
+        envFile: .github/actions/pdm.conf
+    - name: Load Python configuration
+      uses: cardinalby/export-env-action@v2
+      with:
+        envFile: ${{ github.action_path }}/python/${{ inputs.python-version }}.conf
+    - name: Run on VM
+      uses: vmactions/netbsd-vm@v1
+      with:
+        release: ${{ inputs.release }}
+        usesh: true
+        envs: ${{ inputs.envs }}
+        sync: ${{ inputs.sync }}
+        prepare: |
+          set -e
+          /usr/sbin/pkg_add -v pkgin
+          pkgin update
+          pkgin -y install curl git ${{ env.NETBSD_PORTS_FOR_PYTHON }}
+          curl -sSL https://pdm-project.org/install-pdm.py | ${{ env.NETBSD_PYTHON_BIN }} - --version=${{ env.PDM_VERSION }} --path=/usr/local
+          pdm config check_update false
+          pdm config install.cache true
+        run: |
+          set -e
+          pdm install --verbose --frozen-lockfile --global --project=. --no-self --no-default --dev --group=tox
+          tox --version
+          ${{ inputs.run }}
diff --git a/.github/actions/netbsd-vm/python/3.11.conf b/.github/actions/netbsd-vm/python/3.11.conf
new file mode 100644
index 00000000..fac3461e
--- /dev/null
+++ b/.github/actions/netbsd-vm/python/3.11.conf
@@ -0,0 +1,4 @@
+# Use "*" because the name of the python package is something like:
+# python311-3.11.?(nb?)
+NETBSD_PORTS_FOR_PYTHON="python311-*"
+NETBSD_PYTHON_BIN=python3.11
diff --git a/.github/actions/netbsd-vm/python/3.12.conf b/.github/actions/netbsd-vm/python/3.12.conf
new file mode 100644
index 00000000..5ed571a9
--- /dev/null
+++ b/.github/actions/netbsd-vm/python/3.12.conf
@@ -0,0 +1,4 @@
+# Use "*" because the name of the python package is something like:
+# python312-3.12.?(nb?)
+NETBSD_PORTS_FOR_PYTHON="python312-*"
+NETBSD_PYTHON_BIN=python3.12
diff --git a/.github/actions/openbsd-vm/action.yml b/.github/actions/openbsd-vm/action.yml
new file mode 100644
index 00000000..a76aecc3
--- /dev/null
+++ b/.github/actions/openbsd-vm/action.yml
@@ -0,0 +1,74 @@
+name: 'OpenBSD VM'
+description: 'Install OpenBSD VM with python3, PDM and tox pre-installed'
+inputs:
+  python-version:
+    description: "Version range or exact version of Python to use, using SemVer's version range syntax."
+    required: true
+  run:
+    description: 'The CI command to run'
+    required: true
+  release:
+    description: 'The release version of OpenBSD vm'
+    required: false
+  envs:
+    description: 'The envs to pass into OpenBSD vm'
+    required: false
+  sync:
+    description: 'How to synchronize the source code to/from the VM, Values can be:  rsync(default), and sshfs'
+    required: false
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Load PDM configuration from pdm.conf
+      uses: cardinalby/export-env-action@v2
+      with:
+        envFile: .github/actions/pdm.conf
+    - name: Load Python configuration
+      uses: cardinalby/export-env-action@v2
+      with:
+        envFile: ${{ github.action_path }}/python/${{ inputs.python-version }}.conf
+    - name: Install PDM
+      uses: pdm-project/setup-pdm@2f3a9be7ac56a6e5c1ea605f8e9d0f0500363705  # v4
+      id: pdm
+      with:
+        version: ${{ env.PDM_VERSION }}
+        python-version: '3.11'
+    - name: Create requirements.txt files in .github
+      shell: bash
+      run: |
+        set -x
+        pdm export --no-default --format=requirements --without-hashes --output=.github/requirements-mypy.txt \
+          --group=mypy \
+          --group=cbor \
+          --group=msgpack \
+          --group=types-msgpack \
+          --group=trio
+
+        pdm export --no-default --format=requirements --without-hashes --output=.github/requirements-test.txt \
+          --group=test \
+          --group=coverage \
+          --group=cbor \
+          --group=msgpack \
+          --group=trio \
+          --group=test-trio
+
+        cat .github/requirements-mypy.txt
+        cat .github/requirements-test.txt
+      env:
+        PDM_USE_VENV: False
+    - name: Run on VM
+      uses: vmactions/openbsd-vm@v1
+      with:
+        release: ${{ inputs.release }}
+        usesh: true
+        envs: ${{ inputs.envs }}
+        sync: ${{ inputs.sync }}
+        # FIXME: Cannot install tox on OpenBSD: PDM crashes when installing packages
+        # c.f. https://github.com/pdm-project/dep-logic/issues/7
+        prepare: |
+          set -e
+          pkg_add -v -r curl git ${{ env.OPENBSD_PORTS_FOR_PYTHON }}
+        run: |
+          set -e
+          ${{ inputs.run }}
diff --git a/.github/actions/openbsd-vm/python/3.11.conf b/.github/actions/openbsd-vm/python/3.11.conf
new file mode 100644
index 00000000..2bfcdc29
--- /dev/null
+++ b/.github/actions/openbsd-vm/python/3.11.conf
@@ -0,0 +1,2 @@
+OPENBSD_PORTS_FOR_PYTHON=python
+OPENBSD_PYTHON_BIN=python3.11
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 1cc9244a..59fed9c0 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -86,4 +86,57 @@ jobs:
           release: '14.1'
           python-version: '3.11'
           run: |
-            tox --workdir /tmp/.tox run -e mypy-full
+            export TOX_WORK_DIR=/tmp/.tox
+            tox run -e mypy-full
+
+  type-hinting-openbsd:
+    # TODO: Add this when the workflow is stable.
+    # if: |
+    #   (github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'Bump version:'))
+    #   && (github.event_name != 'pull_request' || github.event.pull_request.draft != true)
+    runs-on: ubuntu-24.04
+
+    name: type-hinting (openbsd-7.6)
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Launch checks
+        timeout-minutes: 10
+        uses: ./.github/actions/openbsd-vm
+        with:
+          release: '7.6'
+          python-version: '3.11'
+          # FIXME: Cannot run tox (which uses tox-pdm) on OpenBSD: PDM crashes when installing packages
+          # c.f. https://github.com/pdm-project/dep-logic/issues/7
+          run: |
+            export PYTHONUNBUFFERED=1
+            export MYPY_CACHE_DIR=/tmp/.mypy_cache
+
+            python3.11 -m venv /tmp/.venv
+            . /tmp/.venv/bin/activate
+            pip install -r .github/requirements-mypy.txt -e .
+
+            mypy --config-file=pyproject.toml -p easynetwork
+
+  type-hinting-netbsd:
+    # TODO: Add this when the workflow is stable.
+    # if: |
+    #   (github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'Bump version:'))
+    #   && (github.event_name != 'pull_request' || github.event.pull_request.draft != true)
+    runs-on: ubuntu-24.04
+
+    name: type-hinting (netbsd-10.0)
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Launch checks
+        timeout-minutes: 10
+        uses: ./.github/actions/netbsd-vm
+        with:
+          release: '10.0'
+          python-version: '3.11'
+          run: |
+            export TOX_WORK_DIR=/tmp/.tox
+            tox run -e mypy-full
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1933b998..4f1ffd9a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -139,8 +139,9 @@ jobs:
           release: '14.1'
           python-version: ${{ matrix.python_version }}
           run: |
-            tox --workdir /tmp/.tox run -f ${{ matrix.tox_py }} -- ${{ env.PYTEST_VERBOSE_FLAG }}
-            tox --workdir /tmp/.tox run -f coverage
+            export TOX_WORK_DIR=/tmp/.tox
+            tox run -f ${{ matrix.tox_py }} -- ${{ env.PYTEST_VERBOSE_FLAG }}
+            tox run -f coverage
       - name: Check files in workspace
         if: always()
         run: ls -lA
@@ -166,3 +167,96 @@ jobs:
             test-functional,
             OS-FreeBSD,
             Py-${{ matrix.python_version }}
+
+  test-openbsd:
+    # TODO: Add this when the workflow is stable.
+    # if: |
+    #   (github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'Bump version:'))
+    #   && (github.event_name != 'pull_request' || (github.event.pull_request.draft != true && !contains(github.event.pull_request.labels.*.name, 'pr-skip-test')))
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        # OpenBSD always has a unique Python3 version.
+        python_version: ['3.11']
+        include:
+          - python_version: '3.11'
+            tox_py: py311
+
+    name: test (openbsd-7.6, ${{ matrix.python_version }})
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Launch tests
+        # Add 5 minutes to let the VM boot and install dependencies
+        timeout-minutes: 25
+        uses: ./.github/actions/openbsd-vm
+        with:
+          release: '7.6'
+          python-version: ${{ matrix.python_version }}
+          # FIXME: Cannot run tox (which uses tox-pdm) on OpenBSD: PDM crashes when installing packages
+          # c.f. https://github.com/pdm-project/dep-logic/issues/7
+          run: |
+            export PYTHON=python${{ matrix.python_version }}
+            export PYTHONUNBUFFERED=1
+            export PYTHONHASHSEED=100
+            export PYTEST_ADDOPTS="-p "no:cacheprovider""
+
+            $PYTHON -m venv /tmp/.venv
+            . /tmp/.venv/bin/activate
+            pip install -r .github/requirements-test.txt -e .
+
+            # Launch common checks
+            pytest -m "not unit and not functional" --no-cov ${{ env.PYTEST_VERBOSE_FLAG }}
+
+            # Launch unit tests
+            export COVERAGE_FILE=.coverage.unit
+            pytest -n auto --cov --cov-report=term-missing ${{ env.PYTEST_VERBOSE_FLAG }} tests/unit_test
+            coverage xml -o coverage.unit.xml
+
+            # Launch functional tests
+            export COVERAGE_FILE=.coverage.functional
+            pytest -n auto --cov --cov-report=term-missing ${{ env.PYTEST_VERBOSE_FLAG }} tests/functional_test
+            coverage xml -o coverage.functional.xml
+      - name: Check files in workspace
+        if: always()
+        run: ls -lA
+
+  test-netbsd:
+    # TODO: Add this when the workflow is stable.
+    # if: |
+    #   (github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'Bump version:'))
+    #   && (github.event_name != 'pull_request' || (github.event.pull_request.draft != true && !contains(github.event.pull_request.labels.*.name, 'pr-skip-test')))
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        python_version: ['3.11', '3.12', '3.13']
+        include:
+          - python_version: '3.11'
+            tox_py: py311
+          - python_version: '3.12'
+            tox_py: py312
+          - python_version: '3.13'
+            tox_py: py313
+
+    name: test (netbsd-10.0, ${{ matrix.python_version }})
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Launch tests
+        # Add 5 minutes to let the VM boot and install dependencies
+        timeout-minutes: 25
+        uses: ./.github/actions/netbsd-vm
+        with:
+          release: '10.0'
+          python-version: ${{ matrix.python_version }}
+          run: |
+            export TOX_WORK_DIR=/tmp/.tox
+            tox run -f ${{ matrix.tox_py }} -- ${{ env.PYTEST_VERBOSE_FLAG }}
+            tox run -f coverage
+      - name: Check files in workspace
+        if: always()
+        run: ls -lA
diff --git a/.gitignore b/.gitignore
index 20776814..05d0570a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,6 +13,7 @@ benchmark*.svg
 
 # Github Actions
 .github/.*.key
+.github/requirements*.txt
 
 # Byte-compiled / optimized / DLL files
 __pycache__/