Basically it detects your system and downloads the correct binary from GitHub releases. It also installs .zip, .dmg, .pkg, .deb, .tar.gz and just regular binaries. It can also detect installation scripts from README files or release notes.
Currently in beta but I've personally found it very useful. It supports all operating systems to a degree but hasn't been tested on windows.
I'd love some feedback on it! The end goal is to be able to run justinstall [anything] and have it just work
https://github.com/marcosnils/bin