A few months ago DuckDuckGo pledged to give 10% of gross revenues in 2010 and 2011 to free and open source software (FOSS). I made the 2010 donations today.
We had a discussion on duck.co about where the donations should go. For the 50% company portion, we donated to $482 to nginx and $475 to FreeBSD. These are both projects that are an integral part of our architecture.
For the 50% community-driven portion, we decided it would be a good idea to pick a theme based on all the various suggested projects. That theme for 2010 was security and privacy. To that end, we donated $238 to Tor, $238 to Clamwin, $238 to Taho-LAFS and $238 to OpenSSH (via OpenBSD).