An awesome library to create lightweight GUIs for small scale projects quickly. I've used it for a number of school projects, and it's usually a fairly quick and painless task to get what I need up and running. I've also seen it used a number of times to create editors for student game projects and it was decently capable in those regards too. However, if you're looking to do something on that scale I might recommend using a more fully featured GUI library. For what it is, AntTweakBar does the job quite well.
good job! really good for glut!