Who do I donate to?

jasonmanley writes: "I use an OS called DesktopBSD. The other day I gave some thought to donating some money to the project, but then I got to thinking — who would I donate to? DesktopBSD benefit from FreeBSD and KDE among others. Should I donate to FreeBSD, or what about openSSH if they use that? In fact there are heaps of other project's software embedded in FOSS packages and I would like to know who the community thinks should get the donations."