You have less than one day to download the Humble Indie Bundle from this web site:
It isn’t free, nor open source *SEE UPDATE BELOW*, but is an interesting experiment in getting attention…Marketing! So far according to figures the sellers have compiled they have received over $600,000 and Linux users have been the most generous in setting their price.
If you are interested in this cross platform offer (Windows, Mac and Linux), get on it quickly.
5/11/2010 Update: $325,524 going to charities!
The developers of four of the games have decided to go “open source”.
Aquaria, Gish, Lugaru HD, and Penumbra Overture pledge to go open source. We are preparing the sources right now and will be releasing them ASAP. We spent last night preparing Lugaru and it is available now. The code is still a little rough (no Visual Studio project yet, for instance) but hopefully with the help of the community we can rapidly make it more accessible to everyone.