Redux has some video tutorials up. We have some of the top themes on TF.
We also have extensive documentation and our development hasn't become stagnant.
SMOF hasn't been updated for years, and VafPress (last I heard) was losing its lead developers.
Titan Framework is pretty active, though.
Options Framework is active, but minimal.
The best thing about Option Tree is it has a built in panel builder, but it's hard to port that to a PHP class.
So yea. I'm the lead dev of Redux, but there are lots of options out there. It's just what you want.
But these developers like Redux: http://reduxframework.com/showcase/envato