I just uploaded my free rapid prototyping framework for BlitzMax on GitHub. It has an object oriented design and I already used it to write a few small games for myself and for my company, so it’s quite stable.
The key features so far are:

• simple scene managment
• skinabale gui system
• particle fx system incl. editor
• tilemap engine
• bitmap fonts

You’ll find more information in my Developer Area. The git repository is located at GitHub.