Sparkle 2
A software update framework for macOS
...Sparkle is open source software available under the permissive MIT license, and is developed on GitHub by the Sparkle Project with the help of dozens of valued contributors. Sparkle is kept up to date with the latest Apple technologies such as Touch Bar and Dark Mode. Sparkle supports macOS 10.9 and later. Supports Sparkle's own signatures as well as Apple Code Signing, for ultra-secure updates. Sparkle also supports authentication for installing in secure locations. Support for sandboxing is currently under development. Requires no code in your app, but also provides deep delegate support for maximum customization. ...