A free and open-source audio editor for Windows, Mac, and Linux platforms.
Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming.
Open source project management software great for managing groups of tasks large and small.
FreeMind is a premier free mind-mapping software written in Java
Zim is a great little desktop app for those who want something a little more raw than Evernote, but very functional and customizable.
Simplenote is an easy way to keep notes, lists, ideas, and more. Your notes stay updated across all your devices.
A great open source video editing program for all major desktop operating systems.