[vejeta]

Not exactly what you ask, but for example, for unix textual games, Debian (the GNU/Linux distribution I know best) provides the package called bsdgames: https://packages.debian.org/source/sid/bsdgames where many games like this are provided https://salsa.debian.org/games-team/bsdgames

The thing is that list is not constant and is changing overtime, depending on the usage, demand, and effort to maintain them from the debian maintainers.

I am wondering if such a collection, no matter the license, and no matter the status of the codebase is maintained somewhere (for specific unix/bsd/linux text based games)

[anthk]

BSD games are part of the base TGZ's from OpenBSD. They are perfect to test new cases (pledge, unveil...) without making dangerous experiments with core OS tools.