GIFMaker for Mac - GIFMaker – Created a GIF from a video or Images is the easiest way to create an animated GIF on your Mac.
YouTube GIF Creator - Turn any video into a GIF directly inside YouTube
Giphy - Search all the gifs and make your own animated gif
GIPHY Says - Turn your words into animated GIFs!
CONV. - Convert YouTube video to MP3, GIF or MP4
Gifify - Convert any video file to an optimized animated GIF