Imgur's Video to GIF - Make a GIF from hundreds of video sites
4Gifs.com - Funny Animated GIF archive.
GIFMaker for Mac - GIFMaker – Created a GIF from a video or Images is the easiest way to create an animated GIF on your Mac.
Giphy - Search all the gifs and make your own animated gif
CONV. - Convert YouTube video to MP3, GIF or MP4
crazygif - Crazy and Funny Gifs from real events from life of people and animations.