I have no problem releasing source for the sprite builder. Although I have nothing commented out. (Mainly because I was rushing to get it done) The source for OOT2D will be released when demos are released. That's when I'd feel the most comfortable releasing it anyways. GMare sadly was so close to being done, but it is a complete mess. (Just ask the dev team) I was working on an OpenGL version and a DirectX version, and both are pretty weird. I know what is wrong with it, but cannot find the latest source of it. If I find it, I'll share.
Mammy, for what your interested in, I'd focus on the panel controls within the sprite builder project. The main thing is the UpdateBackbuffer() method, and overriding the OnPaint events. There's where all the magic happens. The PyxPanel just adds a border to the control in the current visual style. PyxTools are just controls I made awhile back that make my life easier. So you can ignore them completely.
I have completed the sprite builder tool. I'm going to submit it as a completed project.