Mongoose publishing produced OGL steampunk.
It has some...flaws..but once you get ovber them, or houserule them away, it's good to go.
The take on magic is interesting, as well as potentially abusive. Rules (some questionable) regarding building devices abound and an interesting take on psionics.
I was amused by a playable vampire race (which turns human in the daylight).
Overall it's a nice read, and I have a campaign going right now of it, but There is probably better out there.
But please..stay away from GURPS
Batts