GitPM is a package manager for Linux (and maybe BSD) that instead of using a database file, similar to how apt or pacman works, it instead uses Git Repositories.
This means you no longer have to worry about updating the cache with apt update or pacman -Sy, as the database is GitHub or GitLab.
To install GitPM, you simply need to have python installed, and the Python module colorama. Then you can simply run
sudo make install