diff --git a/.appveyor.yml b/.appveyor.yml
index 461f775..3b24fbd 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -11,13 +11,8 @@ platform:
 build:
   parallel: true
 
-before_build:
-  - if exist build RMDIR /S /Q build
-  - if not exist build mkdir build
-  - cd build
-
 build_script:
-  - cmake -A %PLATFORM% ..
+  - cmake -A %PLATFORM%
   - cmake --build . --config Debug
   - cmake --build . --config Release
 
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
new file mode 100644
index 0000000..dac4666
--- /dev/null
+++ b/.github/workflows/macos.yml
@@ -0,0 +1,27 @@
+name: macos
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ${{matrix.config.os}}
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+        - { os: macos-10.15, xcode: "12.0.1" } # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode
+        - { os: macos-11.0, xcode: "11.7" }    # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11.0-Readme.md#xcode
+        build: [Debug, Release]
+
+    name: "xcode${{matrix.config.xcode}}:${{matrix.build}}"
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Configure CMake
+      run: cmake -DCMAKE_BUILD_TYPE=${{matrix.build}}
+
+    - name: Build
+      run: cmake --build . --config ${{matrix.build}}
+
+    - name: Tests
+      run: ctest --output-on-failure -C ${{matrix.build}}
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
new file mode 100644
index 0000000..6afe378
--- /dev/null
+++ b/.github/workflows/ubuntu.yml
@@ -0,0 +1,31 @@
+name: ubuntu
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        build: [Debug, Release]
+        compiler:
+        - { cc: "gcc-8", cxx: "g++-8" }
+        - { cc: "gcc-9", cxx: "g++-9" }
+        - { cc: "gcc-10", cxx: "g++-10" }
+        - { cc: "clang-8", cxx: "clang++-8" }
+        - { cc: "clang-9", cxx: "clang++-9" }
+        - { cc: "clang-10", cxx: "clang++-10" }
+
+    name: "${{matrix.compiler.cxx}}:${{matrix.build}}"
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Configure CMake
+      run: cmake -DCMAKE_BUILD_TYPE=${{matrix.build}} -DCMAKE_C_COMPILER=${{matrix.compiler.cc}} -DCMAKE_CXX_COMPILER=${{matrix.compiler.cxx}}
+
+    - name: Build
+      run: cmake --build . --config ${{matrix.build}}
+
+    - name: Tests
+      run: ctest --output-on-failure -C ${{matrix.build}}
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
new file mode 100644
index 0000000..266e389
--- /dev/null
+++ b/.github/workflows/windows.yml
@@ -0,0 +1,28 @@
+name: windows
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ${{matrix.config.os}}
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+        - { os: windows-2016, vs: "Visual Studio 2017" } # https://github.com/actions/virtual-environments/blob/main/images/win/Windows2016-Readme.md#visual-studio-enterprise-2017
+        - { os: windows-2019, vs: "Visual Studio 2019" } # https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md#visual-studio-enterprise-2019
+        build: [Debug, Release]
+        platform: [Win32, x64]
+
+    name: "${{matrix.config.vs}}:${{matrix.platform}}:${{matrix.build}}"
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Configure CMake
+      run: cmake -A ${{matrix.platform}}
+
+    - name: Build
+      run: cmake --build . --config ${{matrix.build}}
+
+    - name: Tests
+      run: ctest --output-on-failure -C ${{matrix.build}}
diff --git a/.travis.yml b/.travis.yml
index 38c5441..4629ddb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,9 @@
 os: linux # Use linux unless specified otherwise.
 dist: bionic
-sudo: required
 
 language: cpp
 
-matrix:
+jobs:
   include:
     - os: linux
       compiler: g++
@@ -116,11 +115,11 @@ before_script:
   - cd build
 
 script:
-  - cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Debug ..
+  - cmake -DCMAKE_BUILD_TYPE=Debug ..
   - cmake --build . --config Debug -- -j${JOBS}
   - ctest --output-on-failure -C Debug -j${JOBS}
   - rm -rf ./*
-  - cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release ..
+  - cmake -DCMAKE_BUILD_TYPE=Release ..
   - cmake --build . --config Release -- -j${JOBS}
   - ctest --output-on-failure -C Release -j${JOBS}