ANGEL Learning has announced that they have incorporated TiddlyWiki into their product and that they have released the source code to the enhancements. What the announcement doesn't mention is that the company also made a financial contribution to TiddlyWiki's main developer Jeremy Ruston in recognition and support of his work.
I happen to have had a number of conversations with the ANGEL folks about this move, starting from early in their process, and I must say that they made every effort to do this right. They put a fair amount of thought, for example, into where they should contribute the code and considered donating it back to the TiddlyWiki community before settling on EduForge. It's sometimes difficult for a smallish company to figure out an affordable way to productively contribute back to open source; I hope that other educational software products, including open source and proprietary LMSs, pick up on ANGEL's contribution and help to build a larger community around it. TiddlyWiki is a great tool for teaching and I think that ANGEL's enhancements to it are rather clever.
Kudos to ANGEL Learning for understanding and respecting the work of an open source community.