While this would not really be my top ten list of open source programs, I think that the list that The Blog Joint has created has some merit, and a few of these could use more exposure.

In their top 10 list they have:
eMule
Audacity
Creative Commons
Ogg
PHP
Wiki
Azureus
Open Office
Linux
Firefox

No doubt some of you have your own thoughts on what should be in that list, and I would love to hear about them, as I am always looking for more great open source software. Is there anything better than Audacity for editing podcasts?