ofxBezierWarp
Performs a warp using openGL bezier surfaces on anything you care to distort/undistort.
Syntax is much like an FBO, with an allocate, begin, end, draw style interface.
It's pretty fast.
Code was adapted from the method described here: http://forum.openframeworks.cc/index.php/topic,4002.0.html
If you're using this software for something cool consider sending me an email to let me know about your project: m@gingold.com.au