I have opened the source to the J2ME version of Pipes. If you’re interested in contributing to the project, it’s hosted on Github:
Anyone is welcome to submit source code, documentation, translations, etc. directly to Github. I’m putting the source under the GPL license.
I’ll be happy to answer questions about the source and the code architecture, but I probably won’t be able to help much regarding how to use Git or Github. Most of my experience has been with Subversion, CVS, and Perforce, so Git is still new to me
Note: The iPhone version of Pipes will remain a separate closed-source project under my personal ownership.