G4EF is in [thread=1211]support for open source[/thread] . If you are involved by any means with any open source project and think that your site can qualify for donations do nominate your project for donation.
Anything you are linked to. Linked means even using it. We would try to contact the Dev team but all the time it would not be positive.
I was thinking GOMLab and Paint.Net as I use them often, but saw that they have already received much donations will find some thing else I thought of TrueCrypt but don't know if it satisifies all the conditions mentioned by Shabbir in the other post