I do odd little bits of Open Source / Free Software / Freeware (depending on my mood), and I've found that if its not linux, it doesn't matter.
If its not linux, then you cannot get onto the "open source" websites (Freshmeat, Slashdot et al), and the sites for (platform of choice) don't even recognise the difference between Open Source / Free Software and Free/Share-ware.
So, just for the record, I write stuff for the PalmOS, using PocketC. You can find it here: http://www.photo.net/users/Thad/
Theres a game (mirror), an implementation of the ANSI C Standard Library, and PocketIFS (mirror), a IFS fractal designer / viewer.
And, incedentally, while, as far as I can tell, these are the best of their kind for this platform, and for the most part, Free / open source, no one gives a damn.
I probably sound more bitter than I am. Its mostly done for the joy of it, but it would be nice to get a thank you, a patch, a bug report, or even a feature request, you know *some* feedback, once in a while. :)
---"The most savage controversies are those about matters as to which there is no good evidence either way." - Bertrand Russell