Now ENLIVEN (a Minetest game) is available for everyone:

https://github.com/poikilos/EnlivenMinetest/releases

:edit 2019-02-27: On Linux distros, the ENLIVEN subgame can be installed via the web (from the various git repositories where mods are located) using the included scripts. The EnlivenMinetest project also includes tools for managing mods via the command line (such as bash functions in an importable rc file). Node.js-based web management features are still a work in progress.

ENLIVEN screenshot