diff --git a/.github/CI_deprecated/.travis.yml b/.github/CI_deprecated/.travis.yml
index b2ec7d2b3f57218d24a5ee9b723b496859fa278f..422b89647c037b0a4037fbd4b7c4676b5659804b 100644
--- a/.github/CI_deprecated/.travis.yml
+++ b/.github/CI_deprecated/.travis.yml
@@ -8,7 +8,7 @@
 # # Environment variables + OS + other parameters
 # global:
 #   - GH_REPO_NAME: openpose
-#   - DOXYFILE: $TRAVIS_BUILD_DIR/scripts/doc_autogeneration.doxygen
+#   - DOXYFILE: $CI_BUILD_DIR/scripts/doc_autogeneration.doxygen
 #   # Set this in Environment Variables on travis-ci.org
 #   # - GH_REPO_REF: github.com/<user_name>/openpose.git
 # matrix:
@@ -34,7 +34,7 @@
 #     sudo: required
 #     # Generate and deploy documentation
 #     after_success:
-#       - cd $TRAVIS_BUILD_DIR
+#       - cd $CI_BUILD_DIR
 #       - chmod +x scripts/generate_gh_pages.sh
 #       - ./scripts/generate_gh_pages.sh
 #   # Ubuntu 16.04 - Python - CMake - CPU
@@ -148,9 +148,9 @@
 
 # # Install Caffe and OP dependencies
 # install:
-#   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo bash scripts/CI/install_deps_ubuntu.sh ; fi
-#   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then bash scripts/CI/install_deps_osx.sh ; fi
-#   - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then exit 99 ; fi
+#   - if [[ "$CI_OS_NAME" == "linux" ]]; then sudo bash scripts/CI/install_deps_ubuntu.sh ; fi
+#   - if [[ "$CI_OS_NAME" == "osx" ]]; then bash scripts/CI/install_deps_osx.sh ; fi
+#   - if [[ "$CI_OS_NAME" == "windows" ]]; then exit 99 ; fi
 
 # # Running CMake
 # before_script:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 25594ae337b6cc177faf22aeb797957e59744d9a..bb1138de7e9e50738c024fd994c06eb740c63953 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,14 +23,14 @@ jobs:
             env:
               NAME: U20-default-cmake-cuda
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # Ubuntu 18.04 - Default - CMake - CUDA
           - os: ubuntu-18.04
             os_name: linux
             env:
               NAME: U18-default-cmake-cuda
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # Ubuntu 20.04 - Python - CMake - CUDA
           - os: ubuntu-20.04
             os_name: linux
@@ -38,9 +38,9 @@ jobs:
               NAME: U20-python-cmake-cuda
               WITH_CUDNN: false
               WITH_PYTHON: true
-              TRAVIS_OS_NAME: linux
-              TRAVIS_BUILD_NUMBER: ${{ github.run_number }}
-              TRAVIS_COMMIT: ${{ github.sha }}
+              CI_OS_NAME: linux
+              CI_BUILD_NUMBER: ${{ github.run_number }}
+              CI_COMMIT: ${{ github.sha }}
               PYTHON3_VERSION: python3.8
             DOCS: true
           # Ubuntu 18.04 - Python - CMake - CUDA
@@ -50,9 +50,9 @@ jobs:
               NAME: U18-python-cmake-cuda
               WITH_CUDNN: false
               WITH_PYTHON: true
-              TRAVIS_OS_NAME: linux
-              TRAVIS_BUILD_NUMBER: ${{ github.run_number }}
-              TRAVIS_COMMIT: ${{ github.sha }}
+              CI_OS_NAME: linux
+              CI_BUILD_NUMBER: ${{ github.run_number }}
+              CI_COMMIT: ${{ github.sha }}
             DOCS: true
           # Ubuntu 20.04 - Python - CMake - CPU
           - os: ubuntu-20.04
@@ -62,7 +62,7 @@ jobs:
               WITH_PYTHON: true
               WITH_CUDA: false
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
               PYTHON3_VERSION: python3.8
           # Ubuntu 18.04 - Python - CMake - CPU
           - os: ubuntu-18.04
@@ -72,7 +72,7 @@ jobs:
               WITH_PYTHON: true
               WITH_CUDA: false
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # Ubuntu 16.04 - Python - CMake - CPU
           - os: ubuntu-16.04
             os_name: linux
@@ -81,7 +81,7 @@ jobs:
               WITH_PYTHON: true
               WITH_CUDA: false
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # TO-DO (not passing)
           # # Ubuntu 20.04 - Python - CMake - OpenCL
           # - os: ubuntu-20.04
@@ -92,7 +92,7 @@ jobs:
           #     WITH_CUDA: false
           #     WITH_CUDNN: false
           #     WITH_OPEN_CL: true
-          #     TRAVIS_OS_NAME: linux
+          #     CI_OS_NAME: linux
           #     PYTHON3_VERSION: python3.8
           # Ubuntu 18.04 - Python - CMake - OpenCL
           - os: ubuntu-18.04
@@ -103,7 +103,7 @@ jobs:
               WITH_CUDA: false
               WITH_CUDNN: false
               WITH_OPEN_CL: true
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # Ubuntu 16.04 - Python - CMake - OpenCL
           - os: ubuntu-16.04
             os_name: linux
@@ -113,7 +113,7 @@ jobs:
               WITH_CUDA: false
               WITH_CUDNN: false
               WITH_OPEN_CL: true
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # Ubuntu 20.04 - Python - CMake - CPU - Debug
           - os: ubuntu-20.04
             os_name: linux
@@ -123,7 +123,7 @@ jobs:
               WITH_CUDA: false
               WITH_CUDNN: false
               WITH_DEBUG: true
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
               PYTHON3_VERSION: python3.8
           # Ubuntu 18.04 - Python - CMake - CPU - Debug
           - os: ubuntu-18.04
@@ -134,7 +134,7 @@ jobs:
               WITH_CUDA: false
               WITH_CUDNN: false
               WITH_DEBUG: true
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # Ubuntu 16.04 - Python - CMake - CPU - Debug
           - os: ubuntu-16.04
             os_name: linux
@@ -144,7 +144,7 @@ jobs:
               WITH_CUDA: false
               WITH_CUDNN: false
               WITH_DEBUG: true
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
           # Ubuntu 20.04 - Python - CMake - CPU - Unity
           - os: ubuntu-20.04
             os_name: linux
@@ -154,7 +154,7 @@ jobs:
               WITH_UNITY: true
               WITH_CUDA: false
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
               PYTHON3_VERSION: python3.8
           # Ubuntu 20.04 - Default - CMake - CPU
           - os: ubuntu-20.04
@@ -163,7 +163,7 @@ jobs:
               NAME: U20-default-cmake-cpu
               WITH_CUDA: false
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: linux
+              CI_OS_NAME: linux
 
           # Mac OSX
           # Mac OSX - Python - CMake - CPU
@@ -174,7 +174,7 @@ jobs:
               WITH_CUDA: false
               WITH_CUDNN: false
               WITH_PYTHON: true
-              TRAVIS_OS_NAME: osx
+              CI_OS_NAME: osx
           # Mac OSX - Python - CMake - OpenCL
           - os: macos-10.15
             os_name: osx
@@ -183,7 +183,7 @@ jobs:
               WITH_CUDA: false
               WITH_CUDNN: false
               WITH_OPEN_CL: true
-              TRAVIS_OS_NAME: osx
+              CI_OS_NAME: osx
           # Mac OSX - Python - CMake - CPU - Debug
           - os: macos-10.15
             os_name: osx
@@ -193,7 +193,7 @@ jobs:
               WITH_CUDNN: false
               WITH_PYTHON: true
               WITH_DEBUG: true
-              TRAVIS_OS_NAME: osx
+              CI_OS_NAME: osx
           # Mac OSX - Python - CMake - CPU - Unity
           - os: macos-10.15
             os_name: osx
@@ -203,7 +203,7 @@ jobs:
               WITH_CUDNN: false
               WITH_PYTHON: true
               WITH_UNITY: true
-              TRAVIS_OS_NAME: osx
+              CI_OS_NAME: osx
           # Mac OSX - Default - CMake - CPU
           - os: macos-10.15
             os_name: osx
@@ -211,7 +211,7 @@ jobs:
               NAME: OSX-default-cmake-cpu
               WITH_CUDA: false
               WITH_CUDNN: false
-              TRAVIS_OS_NAME: osx
+              CI_OS_NAME: osx
 
           # TO-DO (not passing)
           # Note: CUDA jobs fail in U16 because of an issue with GCC 5.5 (https://github.com/NVIDIA/apex/issues/529). GH Actions doesn't support
@@ -222,7 +222,7 @@ jobs:
           #   os_name: linux
           #   env:
           #     NAME: U16-default-cmake-cuda8
-          #     TRAVIS_OS_NAME: linux
+          #     CI_OS_NAME: linux
 
           # # Deprecated (not working for the above issue between CUDA and the Ubuntu16 from GitHub Actions) 
           # # Ubuntu 16.04 - Default - Make - CUDA
@@ -232,7 +232,7 @@ jobs:
           #     NAME: U16-default-make-cuda
           #     WITH_CUDNN: false
           #     WITH_CMAKE: false
-          #     TRAVIS_OS_NAME: linux
+          #     CI_OS_NAME: linux
 
     steps:
     - uses: actions/checkout@v2
diff --git a/doc/contributors.md b/doc/contributors.md
index b46fe33b1e4d0e75e21f1a3f0bb311b5739bbbbb..5fde3f281cb0d7bbee2f0396a07a1b1921522bb2 100644
--- a/doc/contributors.md
+++ b/doc/contributors.md
@@ -19,3 +19,4 @@ We would also like to thank the following people who have highly contributed to
 4. [Luis Fernando Fraga](https://github.com/fragalfernando): Implementation of Lukas-Kanade algorith and person ID extractor.
 5. [Akash Patwal](https://www.linkedin.com/in/akash-patwal-63a12012a): Speedup of the CUDA image resize and visual skeleton rendering, as well as extension that allows OpenPose to speedup linearly to more than 4 GPUs.
 6. [Helen Medina](https://github.com/helen-medina): Initial Windows version.
+7. [Matthijs van der Burgh](https://github.com/MatthijsBurgh): Initial GitHub Actions CI version for Ubuntu and Mac, and ported all the deprecated Travis CI tests into the new CI system.
diff --git a/scripts/CI/configure.sh b/scripts/CI/configure.sh
old mode 100644
new mode 100755
diff --git a/scripts/CI/configure_cmake.sh b/scripts/CI/configure_cmake.sh
old mode 100644
new mode 100755
index 261ccb059b18652a884487b1ad5b87e89c48790c..f4d675c84985fe21e879191ebd578105deb93ed5
--- a/scripts/CI/configure_cmake.sh
+++ b/scripts/CI/configure_cmake.sh
@@ -13,7 +13,7 @@ fi
 
 echo "WITH_PYTHON = ${WITH_PYTHON}."
 if [[ $WITH_PYTHON == true ]] ; then
-  if [[ "$TRAVIS_OS_NAME" == "linux" ]] ; then
+  if [[ "$CI_OS_NAME" == "linux" ]] ; then
     ARGS="$ARGS -DBUILD_PYTHON=On"
     if [[ $PYTHON3_VERSION ]] ; then
       ARGS="$ARGS -DPYTHON_EXECUTABLE=/usr/bin/${PYTHON3_VERSION} -DPYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/lib${PYTHON3_VERSION}m.so"
@@ -22,7 +22,7 @@ if [[ $WITH_PYTHON == true ]] ; then
       ARGS="$ARGS -DPYTHON_EXECUTABLE=/usr/bin/python2.7 -DPYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython2.7m.so"
     fi
   fi
-  if [[ "$TRAVIS_OS_NAME" == "osx" ]] ; then
+  if [[ "$CI_OS_NAME" == "osx" ]] ; then
     ARGS="$ARGS -DBUILD_PYTHON=On -DPYTHON_EXECUTABLE=/usr/local/bin/python2.7 -DPYTHON_LIBRARY=/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7m.dylib"
   fi
   echo "Python arguments = $ARGS"
@@ -71,7 +71,7 @@ echo "ARGS = ${ARGS}."
 cmake .. $ARGS
 
 # Patch for OpenCL and OSX
-if [[ $WITH_OPEN_CL == true && $TRAVIS_OS_NAME == "osx" ]] ; then
+if [[ $WITH_OPEN_CL == true && $CI_OS_NAME == "osx" ]] ; then
   cd ../3rdparty/caffe; git apply ../../scripts/osx/mac_opencl_patch.txt;
   cd ../../build;
 fi
diff --git a/scripts/CI/configure_make.sh b/scripts/CI/configure_make.sh
old mode 100644
new mode 100755
diff --git a/scripts/CI/defaults.sh b/scripts/CI/defaults.sh
old mode 100644
new mode 100755
index 4d0e853457612b3e7f4885ba6668e5928fb3ee02..e61ed268ba90300da940b490848922f53a43cd11
--- a/scripts/CI/defaults.sh
+++ b/scripts/CI/defaults.sh
@@ -2,7 +2,7 @@
 
 # Set default environment variables
 set -e
-TRAVIS_OS_NAME=${TRAVIS_OS_NAME}
+CI_OS_NAME=${CI_OS_NAME}
 WITH_CMAKE=${WITH_CMAKE:-true}
 WITH_PYTHON=${WITH_PYTHON:-false}
 WITH_CUDA=${WITH_CUDA:-true}
@@ -18,7 +18,7 @@ then
   WITH_CUDNN=false
 fi
 
-# Examples should be run (Travis not compatible with GPU code)
+# Examples should be run (CI environment not compatible with GPU code)
 # if [[ $WITH_CMAKE == true ]] && [[ $WITH_PYTHON == true ]] && [[ $WITH_CUDA == false ]] && [[ $WITH_OPEN_CL == false ]] && [[ $WITH_MKL == false ]]; then
 if [[ $WITH_CUDA == false ]] && [[ $WITH_OPEN_CL == false ]] && [[ $WITH_UNITY == false ]]; then
   RUN_EXAMPLES=true
diff --git a/scripts/CI/install_deps_osx.sh b/scripts/CI/install_deps_osx.sh
old mode 100644
new mode 100755
diff --git a/scripts/CI/install_deps_ubuntu.sh b/scripts/CI/install_deps_ubuntu.sh
old mode 100644
new mode 100755
index a0a0192f9222d94910ac891d7e1046defa46e165..e10568eea584b11be606e5fb8c11f69ea0bde78e
--- a/scripts/CI/install_deps_ubuntu.sh
+++ b/scripts/CI/install_deps_ubuntu.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Install dependencies for Ubuntu
-echo "Running on ${TRAVIS_OS_NAME} OS."
+echo "Running on ${CI_OS_NAME} OS."
 
 BASEDIR=$(dirname $0)
 source $BASEDIR/defaults.sh
diff --git a/scripts/CI/run_make.sh b/scripts/CI/run_make.sh
old mode 100644
new mode 100755
index 0233ea79a7f8e961c4d30571432ec91f3334025c..ac8554003d4271158bc7536e515d4222630887a9
--- a/scripts/CI/run_make.sh
+++ b/scripts/CI/run_make.sh
@@ -7,9 +7,9 @@ source $BASEDIR/defaults.sh
 
 if [[ $WITH_CMAKE == true ]] ; then
   cd build
-  if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then make -j`nproc` ; fi
-  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then make -j`sysctl -n hw.logicalcpu` ; fi
+  if [[ "$CI_OS_NAME" == "linux" ]]; then make -j`nproc` ; fi
+  if [[ "$CI_OS_NAME" == "osx" ]]; then make -j`sysctl -n hw.logicalcpu` ; fi
 else
-  if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then make all -j`nproc` ; fi
-  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then make all -j`sysctl -n hw.logicalcpu` ; fi
+  if [[ "$CI_OS_NAME" == "linux" ]]; then make all -j`nproc` ; fi
+  if [[ "$CI_OS_NAME" == "osx" ]]; then make all -j`sysctl -n hw.logicalcpu` ; fi
 fi
diff --git a/scripts/CI/run_tests.sh b/scripts/CI/run_tests.sh
old mode 100644
new mode 100755
index 6d1274b4860e64d872bc7e87ffee981620967900..9dc054993c32155874c3bbead42fb2d0905634ab
--- a/scripts/CI/run_tests.sh
+++ b/scripts/CI/run_tests.sh
@@ -107,7 +107,7 @@ if [[ $RUN_EXAMPLES == true ]] ; then
 
   echo "Demos and tutorials successfully finished!"
 
-# Disable examples for all other Travis Build configurations
+# Disable examples for all other CI Build configurations
 else
   echo "Skipping tests for non CPU-only versions."
   exit 0
diff --git a/scripts/generate_gh_pages.sh b/scripts/generate_gh_pages.sh
index b8799da175258f5616afba16c4bcf070e076d367..4436dbdb838343514842041852cbecb0a179b4a3 100755
--- a/scripts/generate_gh_pages.sh
+++ b/scripts/generate_gh_pages.sh
@@ -8,13 +8,13 @@ __AUTHOR__="openpose"
 # - Packages doxygen doxygen-doc doxygen-latex doxygen-gui graphviz
 #   must be installed.
 # - Doxygen configuration file must have the destination directory empty and
-#   source code directory with a $(TRAVIS_BUILD_DIR) prefix.
+#   source code directory with a $(CI_BUILD_DIR) prefix.
 # - An gh-pages branch should already exist. See below for mor info on hoe to
 #   create a gh-pages branch.
 #
 # Required global variables:
-# - TRAVIS_BUILD_NUMBER : The number of the current build.
-# - TRAVIS_COMMIT       : The commit that the current build is testing.
+# - CI_BUILD_NUMBER : The number of the current build.
+# - CI_COMMIT       : The commit that the current build is testing.
 # - DOXYFILE            : The Doxygen configuration file.
 # - GH_REPO_NAME        : The name of the repository.
 # - GH_REPO_REF         : The GitHub reference to the repository.
@@ -71,8 +71,8 @@ echo "" > .nojekyll
 ##### Generate the Doxygen code documentation and log the output.          #####
 echo 'Generating Doxygen code documentation...'
 # Redirect both stderr and stdout to the log file AND the console.
-echo "INPUT                  = ${TRAVIS_BUILD_DIR}/README.md ${TRAVIS_BUILD_DIR}/include/openpose/" >> $DOXYFILE
-echo "USE_MDFILE_AS_MAINPAGE = ${TRAVIS_BUILD_DIR}/README.md" >> $DOXYFILE
+echo "INPUT                  = ${CI_BUILD_DIR}/README.md ${CI_BUILD_DIR}/include/openpose/" >> $DOXYFILE
+echo "USE_MDFILE_AS_MAINPAGE = ${CI_BUILD_DIR}/README.md" >> $DOXYFILE
 echo "OUTPUT_DIRECTORY       = " >> $DOXYFILE
 doxygen $DOXYFILE 2>&1 | tee doxygen.log
 
@@ -92,7 +92,7 @@ if [ -d "html" ] && [ -f "html/index.html" ]; then
 
     # Commit the added files with a title and description containing the Travis CI
     # build number and the GitHub commit reference that issued this build.
-    git commit -m "Deploy code docs to GitHub Pages Travis build: ${TRAVIS_BUILD_NUMBER}" -m "Commit: ${TRAVIS_COMMIT}"
+    git commit -m "Deploy code docs to GitHub Pages Travis build: ${CI_BUILD_NUMBER}" -m "Commit: ${CI_COMMIT}"
 
     # Force push to the remote gh-pages branch.
     # The ouput is redirected to /dev/null to hide any sensitive credential data