Quicktime Pro - easy, powerful way to assemble your folder of frames (image sequence) into an animation, then save out to codex/compression.

After Effects for animation post processing

EditPlus (fantastic text and html editor)
http://www.editplus.com/

and last but not least....
Canvas  (ACD) ...which I am sure no one else has heard of, uses or would purchase (because there are a lot of free and low cost 2D apps). You don't need Canvas Ten...Canvas 8 is all you need, works for Mac and PC.
http://www.deneba.com/buy/dr_store/product_list.html
I'm putting this link because it memorializes a very great, very flexible competetor for Photoshop that ALSO is a 'painter.' In many ways it is better than PS. It can also import a folder of frames and make animated gifs.