This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
I focus on non commercial free games that are also (for the most part) Open Source too.
Luanti: Website | Flathub | PCGamingWiki | Video | Very close Minecraft like clone (note its old name was Minetest for the longest time). Each downloadable subgame requires extremely low space, in the MBytes range! No account or any online servers are needed (edit: off course its needed to download, but not otherwise). Open Source.
osu!: Website | Flathub | PCGamingWiki | Video | Rhythm style game where you use the mouse. I think the code is Open Source, but not the assets? I’m not sure.
Taisei Project: Website | Flathub | PCGamingWiki | Video | Fan project in the Touhou Project series. Old school bullet hell shmup from top down perspective. Open Source.
Note Flathub is a repository for Linux. If you are on Windows, go to their website and look for downloads.
Regarding osu’s source code, I think the original osu (osu!stable) is closed-source, and I think the servers might be closed-source, but I believe osu!lazer, the new reimplementation in C#, is fully opensource. It’s an ongoing effort and a long-term migration it’s in the middle of, but lazer looks great and I think it’s already meant to be the main version now.
Stable is also dead, thats part of the reason its closed source and staying that way. He doesn’t want people using it and it will be retired entirely at some point. Its basically a unsaveable pile of pasta.
I focus on non commercial free games that are also (for the most part) Open Source too.
Note Flathub is a repository for Linux. If you are on Windows, go to their website and look for downloads.
Regarding osu’s source code, I think the original osu (osu!stable) is closed-source, and I think the servers might be closed-source, but I believe osu!lazer, the new reimplementation in C#, is fully opensource. It’s an ongoing effort and a long-term migration it’s in the middle of, but lazer looks great and I think it’s already meant to be the main version now.
Stable is also dead, thats part of the reason its closed source and staying that way. He doesn’t want people using it and it will be retired entirely at some point. Its basically a unsaveable pile of pasta.
For Luanti I want to especially recommend the Game “Glitch” which is not minecraft like at all, but surprisingly great.