Especially if what you want involves software. You end up writing it yourself.
If you take a look at the Engine Manifesto that I wrote about this time last year, updated once or twice, and cleaned up for the public, you will notice that I don't ask for much. I've been working on this for the past 6 months, but for once, I'm actually getting something done to the point that its useful. Once I have some of my copyright searches clear, I guess I'll release a little alpha and have a name vote/contest.
That is, after I get the win32 ports (VC and mingw) working completely again.