The VOIDRUNNER'S CODEX is LIVE! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
There's Orcus which is specifically designed to be backwards compatible with D&D 4e, but has been reimagined with new terminology to avoid legal entanglements (because of the no OGL issue).
I haven't read it in depth yet (been busy with other stuff), but on a quick read through, the layout and graphic design is amazing - and the DriveThruRPG .zip file includes a no-art, text-only, version of the game, as well (something I wish more publishers did).
Four. Fighting Man (Person), Cleric, Magic-User, Thief. This is enough to emulate TONS of popular fantasy fiction, both of yesteryear and contemporary stuff. You can always add more in supplements, of course. But I'm in favor of Four Core.
Dude. Absolutely. I'm currently editing/proofreading a AAA tabletop RPG and I made uh... definitely not 500k. I'm super-excited about it and everything (the reason I'm not talking about it very much is because I'm at least semi-professional), but if somebody dumped a half a million dollars in my...