This thread is similar to the monthly "Who is hiring?" and "Freelancer? Seeking freelancer?" threads.
But this one is for people who don't want to work for money and are not looking for people who want to work for money. But for people who want to work together on cool projects.
For free to make the world better or to start a startup.
If you do, please post your project or your skills!
(Inspired by https://news.ycombinator.com/item?id=30162767 )
https://github.com/stride3d/stride
The code base is already mature and very professional. The quality standards are fairly high, but that's a nice challenge and you can even learn a lot, depending on your level of experience.
As for the history, Stride was developed commercially by Silicon Studio for about 10 years but couldn't complete with the big two on that level. So it was open-sourced about 3 years ago and the main developer is still maintaining it, but he has a full-time job. The team isn't very big yet, but quite capable people.
It's a great product and the only truly open-source C# game engine with a high-end render engine and proper asset pipeline. The shader system is the best I've ever seen, it's absolutely mind-blowing.
Let me know if you want to learn more about it... Or hop onto the discord server and have a chat: https://discord.gg/f6aerfE