Yup. Personally, as an indie developer who is certainly not massively wealthy, I've submitted a PR to GLFW (my windowing/input system) to support Retina screens on OS X. Of my other open-source dependencies (boost, vorbisfile, logog, physfs, and GLEW), there's just nothing I've needed to patch. Otherwise I would've.
There's nothing under GPL/LGPL I need or particularly want, but I do benefit from BSD-based stuff if only because I can't statically link LGPL stuff and I find the GPL unethical. Of course I'll give back where I change stuff, because I'm not an asshole. But GPL/LGPL ignores reality in too many ways to be viable; I personally like the CDDL quite a bit but nobody uses it.
There's nothing under GPL/LGPL I need or particularly want, but I do benefit from BSD-based stuff if only because I can't statically link LGPL stuff and I find the GPL unethical. Of course I'll give back where I change stuff, because I'm not an asshole. But GPL/LGPL ignores reality in too many ways to be viable; I personally like the CDDL quite a bit but nobody uses it.