For somewhat larger projects, I think the OS Haiku is a perfect example. It isn’t a benevolent dictatorship, there is no single leader — there are just long-time contributors. If you send in contributions substantive or regular enough, there’s a good chance you’ll get push access. Patches generally are accepted with open arms, and devs with push access give constructive criticism on patches kindly. The OS is better for it!

Better yet, check out NewPipe on F-Droid. :^)

It looks real slick, but there is one note-worthy bit:

• Does Kera Desktop only support web apps?
  For now, yes. Support for Linux apps is perfectly possible and on the roadmap. For other platforms, we will see what’s possible.

I’m not a fan of web-apps generally, but the transparency sure is pretty! @o@