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Just finding out Kerbal Space Program 2 is dead
(www.youtube.com)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
Check out the OpenSpaceProgram project on github. It's undergoing some major changes right now but is the most promising existing base to build on imo (osp-msgnum is the repo you're looking for).
Also to set expectations for lurkers- the project is currently an early physics test with some orbital mechanics proof of concept. Don't expect anything substantial for years