Most employers will do a match if the donation is to a charity. Things like the Debian project (although the charity that manages it has a different name), FSF,

Most employers will do a match if the donation is to a charity. Things like the Debian project (although the charity that manages it has a different name), FSF, etc, qualify. Always check with your employer before making a donation in case they're willing to contribute, too. Also, donations are often tax deductible. (edit: I am an fsf member and have contributed to the Debian project)