I found two:

Jahshaka

It is an open source free, video editing software, effects, and compositing suite.
When I used it several months back, it was very unintuitive and I couldn't figure out how to use it. However, there are tutorials for Jahshaka now.

Kdenlive

Kdenlive is an open source, multi track video editor released under the GNU Public Licence.

(The screenshot is of Kdenlive running on Windows, but it is available for the Mac through Macports)

According to APSL you are allowed to modify and use their library for profit uses as long as you A)Leave the apple copyright code intact and B)you include the modified code. You don't have to make your entire project open-source but the modified library does have to be open-source. Hope this helps!