GIFs

Animated GIFs in Photoshop
A tutorial for creating Animated GIFs in Photoshop.

Cinemagram
App for iPhone users, which creates GIFs that feel more like mini-movies. Free.

Gickr*
Create animated GIFs. Free but a small watermark is placed in the corner.

Gif Boom
GIF-making app for iPhone and Android that allows you to sidestep clunky web-based GIF creators. Free.

Gif Hound
GIFs about news.

Gif Soup
Find animated GIFs.

Gifbin
Find and create animated GIFs.

Picasion 
Create animated GIFs. Free but a watermark is placed in the corner.

Reaction Gifs   NO LONGER AVAILABLE
Find and create animated GIFs.