iLove VideoToGif
iLove VideotoGif is a freeware utility which can convert video to gif animation simply and fast. It can convert almost all popular video formats to gif, including AVI, WMV, MPEG, MOV, FLV, MP4, 3GP, VOB, etc. It is possible to trim long video and convert only a segment of video to gif. You can also set the output width and height, change the GIF animation speed.
Available on Mac App Store