Hazel
Lightweight update server for Electron apps
...Since Hazel routes all the traffic for downloading the actual application files to GitHub Releases, you can use their API to determine the download count for a certain release. Display an overview page showing the cached repository with the different available platforms and file sizes. Links to the repo, releases, specific cached version and direct downloads for each platform are present. Automatically detects the platform/OS of the visitor by parsing the user agent and then downloads the appropriate copy of your application.