Unofficial all-platform source tarballs for Chromium, unlike the official ones that you can download from https://commondatastorage.googleapis.com/chromium-browser-official/, the source tarballs provided by this project can be used to build on Windows and macOS.
The source tarballs are automatically generated when there is a new release from the Chrome Releases blog.
The source tarballs can be downloaded and built using the build_chromium project.