diff --git a/.github/config/android-arm.json b/.github/config/android-arm.json
index 9ca34bb905096..aec0538172def 100644
--- a/.github/config/android-arm.json
+++ b/.github/config/android-arm.json
@@ -3,11 +3,7 @@
   "on_device_test": {
     "enabled": true,
     "tests": [
-      "0",
-      "1",
-      "2",
-      "3",
-      "black_box_test"
+      "1"
     ]
   },
   "platforms": [
diff --git a/.github/config/raspi-2.json b/.github/config/raspi-2.json
index 03f722031e902..e5ebad75025db 100644
--- a/.github/config/raspi-2.json
+++ b/.github/config/raspi-2.json
@@ -3,12 +3,7 @@
   "on_device_test": {
     "enabled": true,
     "tests": [
-      "0",
-      "1",
-      "2",
-      "3",
-      "4",
-      "5"
+      "1"
     ]
   },
   "platforms": [
diff --git a/.github/workflows/android.yaml b/.github/workflows/android.yaml
index 852bbbcc7d76e..b68e41b600ebc 100644
--- a/.github/workflows/android.yaml
+++ b/.github/workflows/android.yaml
@@ -24,24 +24,6 @@ on:
         default: false
 
 jobs:
-  android-arm64:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: android-arm64
-      nightly: ${{ github.event.inputs.nightly }}
-      keep_artifacts: cobalt.apk
-  android-x86:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: android-x86
-      nightly: ${{ github.event.inputs.nightly }}
-      keep_artifacts: cobalt.apk
   android-arm:
     uses: ./.github/workflows/main.yaml
     permissions:
@@ -51,58 +33,3 @@ jobs:
       platform: android-arm
       nightly: ${{ github.event.inputs.nightly }}
       keep_artifacts: cobalt.apk
-
-  upload-release-artifacts:
-    runs-on: ubuntu-latest
-    needs: [ android-arm, android-arm64, android-x86 ]
-    permissions:
-      actions: write
-      contents: write
-    steps:
-      - name: Download arm-gold apk
-        uses: actions/download-artifact@v4
-        with:
-          name: android-arm-gold
-          path: arm-gold
-      - name: Download arm-qa apk
-        uses: actions/download-artifact@v4
-        with:
-          name: android-arm-qa
-          path: arm-qa
-      - name: Download arm64-gold apk
-        uses: actions/download-artifact@v4
-        with:
-          name: android-arm64-gold
-          path: arm64-gold
-      - name: Download arm64-qa apk
-        uses: actions/download-artifact@v4
-        with:
-          name: android-arm64-gold
-          path: arm64-qa
-      - name: Download x86-gold apk
-        uses: actions/download-artifact@v4
-        with:
-          name: android-x86-gold
-          path: x86-gold
-      - name: Download x86-qa apk
-        uses: actions/download-artifact@v4
-        with:
-          name: android-x86-qa
-          path: x86-qa
-      - name: 'Upload Android APKs'
-        uses: actions/upload-artifact@v4
-        with:
-          name: Android APKs
-          path: ./*
-          retention-days: 90
-          compression-level: 0 # We expect kept artifacts to be already compressed
-          if-no-files-found: error
-      - name: Make a release zip
-        run: zip -0 -r "Android APKs.zip" . -i '*.apk'
-      - name: Upload the APKs to a release
-        if: ${{ github.event_name == 'release' }}
-        uses: svenstaro/upload-release-action@04733e069f2d7f7f0b4aebc4fbdbce8613b03ccd # v2.9.0
-        with:
-          repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: "Android APKs.zip"
-          overwrite: true
diff --git a/.github/workflows/coverage.yaml b/.github/workflows/coverage.yaml
deleted file mode 100644
index 834696dcd1123..0000000000000
--- a/.github/workflows/coverage.yaml
+++ /dev/null
@@ -1,30 +0,0 @@
-name: coverage
-
-on:
-  pull_request:
-    types:
-      - opened
-      - edited
-      - reopened
-      - synchronize
-  push:
-    branches:
-      - main
-      - feature/*
-
-jobs:
-  linux-coverage:
-    # TODO(b/286302961): Move back and re-enable this check once sharding is supported.
-    # Run on main branch for pushes, PRs and manual invocations.
-    # if: |
-    #  ${{ github.ref == 'refs/heads/main' &&
-    #      (github.event_name == 'push' ||
-    #      github.event_name == 'pull_request' ||
-    #      (github.event_name == 'workflow_dispatch' && inputs.nightly == 'false')) }}
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: linux-coverage
-      nightly: ${{ github.event.inputs.nightly }}
diff --git a/.github/workflows/evergreen.yaml b/.github/workflows/evergreen.yaml
deleted file mode 100644
index 13005138cfd5f..0000000000000
--- a/.github/workflows/evergreen.yaml
+++ /dev/null
@@ -1,60 +0,0 @@
-name: evergreen
-
-on:
-  pull_request:
-    types: [opened, reopened, synchronize, labeled]
-    branches:
-      - main
-      - feature/*
-  push:
-    branches:
-      - main
-      - feature/*
-  schedule:
-    # GMT timezone.
-    - cron: '0 9 * * *'
-  workflow_dispatch:
-    inputs:
-      nightly:
-        description: 'Nightly workflow.'
-        required: true
-        type: boolean
-        default: false
-
-jobs:
-  evergreen-x64:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: evergreen-x64
-      nightly: ${{ github.event.inputs.nightly }}
-      run_api_leak_detector: true
-  evergreen-arm-hardfp:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: evergreen-arm-hardfp
-      nightly: ${{ github.event.inputs.nightly }}
-      run_api_leak_detector: true
-  evergreen-arm-softfp:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: evergreen-arm-softfp
-      nightly: ${{ github.event.inputs.nightly }}
-      run_api_leak_detector: true
-  evergreen-arm64:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: evergreen-arm64
-      nightly: ${{ github.event.inputs.nightly }}
-      run_api_leak_detector: true
diff --git a/.github/workflows/gradle.yaml b/.github/workflows/gradle.yaml
deleted file mode 100644
index 7dec25a395854..0000000000000
--- a/.github/workflows/gradle.yaml
+++ /dev/null
@@ -1,34 +0,0 @@
-name: Java Tests
-
-on:
-  pull_request:
-  push:
-    branches:
-      - main
-      - feature/*
-
-concurrency:
-  group: '${{ github.workflow }}-${{ github.event_name }}-${{ inputs.platform }} @ ${{ github.event.pull_request.number || github.sha }}'
-  cancel-in-progress: true
-
-permissions: {}
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: kaidokert/checkout@v3.5.999
-        timeout-minutes: 30
-      - name: Set up JDK 11
-        uses: actions/setup-java@v3
-        with:
-          distribution: 'zulu'
-          java-version: 11
-      - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@ccb4328a959376b642e027874838f60f8e596de3 #v1.0.6
-      - name: Build with Gradle
-        uses: gradle/gradle-build-action@749f47bda3e44aa060e82d7b3ef7e40d953bd629 #v2.4.2
-        with:
-          arguments: test
-          build-root-directory: starboard/android/apk
diff --git a/.github/workflows/linux.yaml b/.github/workflows/linux.yaml
deleted file mode 100644
index f144ef72f4ab3..0000000000000
--- a/.github/workflows/linux.yaml
+++ /dev/null
@@ -1,60 +0,0 @@
-name: linux
-
-on:
-  pull_request:
-    types: [opened, reopened, synchronize, labeled]
-    branches:
-      - main
-      - feature/*
-  push:
-    branches:
-      - main
-      - feature/*
-  schedule:
-    # GMT timezone.
-    - cron: '0 9 * * *'
-  workflow_dispatch:
-    inputs:
-      nightly:
-        description: 'Nightly workflow.'
-        required: true
-        type: boolean
-        default: false
-
-jobs:
-  linux-x64:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: linux
-      nightly: ${{ github.event.inputs.nightly }}
-  linux-clang-3-9:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: linux-clang-3-9
-      nightly: ${{ github.event.inputs.nightly }}
-      modular: true
-  linux-gcc-6-3:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: linux-gcc-6-3
-      nightly: ${{ github.event.inputs.nightly }}
-      modular: true
-  # TODO(b/285632780): Enable blackbox tests for modular linux workflows.
-  linux-modular:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: linux-modular
-      nightly: ${{ github.event.inputs.nightly }}
-      modular: true
diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
deleted file mode 100644
index 9f4382462b0ac..0000000000000
--- a/.github/workflows/pytest.yaml
+++ /dev/null
@@ -1,41 +0,0 @@
-name: python-tests
-
-on:
-  pull_request:
-  push:
-    branches:
-      - main
-      - feature/*
-
-concurrency:
-  group: '${{ github.workflow }}-${{ github.event_name }}-${{ inputs.platform }} @ ${{ github.event.pull_request.number || github.sha }}'
-  cancel-in-progress: true
-
-permissions: {}
-
-jobs:
-  python-test:
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest]
-        python-version: ['3.8', '3.11']
-      fail-fast: false
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 15
-    steps:
-      - name: Checkout
-        uses: kaidokert/checkout@v3.5.999
-        with:
-          fetch-depth: 1
-          persist-credentials: false
-      - name: Setup Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: ${{ matrix.python-version }}
-          cache: 'pip'
-      - name: Install Pip Packages
-        run: pip install --require-hashes --no-deps -r ${{ github.workspace }}/docker/pytest/requirements.txt
-      - name: Run Tests
-        run: coverage run -m pytest
-      - name: Coverage Report
-        run: coverage report -m
diff --git a/.github/workflows/raspi-2.yaml b/.github/workflows/raspi-2.yaml
index 8613cfaf83d2c..c331b59cba63a 100644
--- a/.github/workflows/raspi-2.yaml
+++ b/.github/workflows/raspi-2.yaml
@@ -30,11 +30,3 @@ jobs:
     with:
       platform: raspi-2
       nightly: ${{ github.event.inputs.nightly }}
-  raspi-2-skia:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: raspi-2-skia
-      nightly: ${{ github.event.inputs.nightly }}
diff --git a/.github/workflows/stub.yaml b/.github/workflows/stub.yaml
deleted file mode 100644
index 17e8b74082f52..0000000000000
--- a/.github/workflows/stub.yaml
+++ /dev/null
@@ -1,30 +0,0 @@
-name: stub
-
-on:
-  pull_request:
-    types: [opened, reopened, synchronize, labeled]
-    branches:
-      - main
-      - feature/*
-  push:
-    branches:
-      - main
-      - feature/*
-  workflow_dispatch:
-    inputs:
-      nightly:
-        description: 'Nightly workflow.'
-        required: true
-        type: boolean
-        default: false
-
-jobs:
-  stub:
-    uses: ./.github/workflows/main.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: stub
-      nightly: ${{ github.event.inputs.nightly }}
-      leak_manifest_filename: "gn_built_docker_debian11_manifest"
diff --git a/.github/workflows/win32.yaml b/.github/workflows/win32.yaml
deleted file mode 100644
index 988cbb2ef464a..0000000000000
--- a/.github/workflows/win32.yaml
+++ /dev/null
@@ -1,32 +0,0 @@
-name: win32
-
-on:
-  pull_request:
-    types: [opened, reopened, synchronize, labeled]
-    branches:
-      - main
-      - feature/*
-  push:
-    branches:
-      - main
-      - feature/*
-  schedule:
-    # GTM timezone.
-    - cron: '0 9 * * *'
-  workflow_dispatch:
-    inputs:
-      nightly:
-        description: 'Nightly workflow.'
-        required: true
-        type: boolean
-        default: false
-
-jobs:
-  win32:
-    uses: ./.github/workflows/main_win.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: win32
-      nightly: ${{ github.event.inputs.nightly }}
diff --git a/.github/workflows/xb1.yaml b/.github/workflows/xb1.yaml
deleted file mode 100644
index d819721ee67a6..0000000000000
--- a/.github/workflows/xb1.yaml
+++ /dev/null
@@ -1,32 +0,0 @@
-name: xb1
-
-on:
-  pull_request:
-    types: [opened, reopened, synchronize, labeled]
-    branches:
-      - main
-      - feature/*
-  push:
-    branches:
-      - main
-      - feature/*
-  schedule:
-    # GTM timezone.
-    - cron: '0 9 * * *'
-  workflow_dispatch:
-    inputs:
-      nightly:
-        description: 'Nightly workflow.'
-        required: true
-        type: boolean
-        default: false
-
-jobs:
-  xb1:
-    uses: ./.github/workflows/main_win.yaml
-    permissions:
-      packages: write
-      pull-requests: write
-    with:
-      platform: xb1
-      nightly: ${{ github.event.inputs.nightly }}