diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 90f1781b..bd682e29 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,23 +1,130 @@
 name: CI
 on:
   push:
-    branches: [ feature/github-actions-for-windows-compilers ]
+    branches: [ master ]
   pull_request:
     branches: [ master ]
 
 jobs:
-  build-windows-vs2019:
-    name: Windows VS2019 Debug
-    runs-on: [windows-latest]
+  build-gcc-linux:
+    name: GCC Linux
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04]
 
     steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-      with:
-        submodules: recursive
+    - uses: actions/checkout@v2
 
     - name: Build
-      run: "C:\Program Files (x86)/Microsoft Visual Studio/2019/Enterprise/MSBuild/Current/Bin/msbuild.exe" /p:Configuration=Debug /p:Platform=x86
+      run: |
+        cmake -DBUILD_TESTS=ON ./
+        gcc --version
+        make
+    
+    - name: Run tests
+      run: ./test/etl_tests
+
+  build-gcc-linux-no-stl:
+    name: GCC Linux No STL
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Build
+      run: |
+        cmake -DBUILD_TESTS=ON -DNO_STL=ON ./
+        gcc --version
+        make
+    
+    - name: Run tests
+      run: ./test/etl_tests
+
+  build-clang-9-linux:
+    name: Clang-9 Linux
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Build
+      run: |
+        export CC=clang-9
+        export CXX=clang++-9
+        cmake -D BUILD_TESTS=ON ./
+        clang --version
+        make
 
     - name: Run tests
       run: ./test/etl_tests
+
+  build-clang-9-linux-no-stl:
+    name: Clang-9 Linux No STL
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Build
+      run: |
+        export CC=clang-9
+        export CXX=clang++-9
+        cmake -D BUILD_TESTS=ON -DNO_STL=ON ./
+        clang --version
+        make
+
+    - name: Run tests
+      run: ./test/etl_tests
+
+  build-clang-10-osx:
+    name: Clang-10 OSX
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-10.15]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Build
+      run: |
+        export CC=clang
+        export CXX=clang++
+        cmake -D BUILD_TESTS=ON ./
+        clang --version
+        make
+
+    - name: Run tests
+      run: ./test/etl_tests
+
+  build-clang-10-osx-no-stl:
+    name: Clang-10 OSX No STL
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-10.15]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Build
+      run: |
+        export CC=clang
+        export CXX=clang++
+        cmake -D BUILD_TESTS=ON -DNO_STL=ON ./
+        clang --version
+        make
+
+    - name: Run tests
+      run: ./test/etl_tests
+