Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Any To GIF - Convert any picture into an animated GIF file.
GIMP - GIMP is a multiplatform photo manipulation tool.
Picasion - Great site for creating animated GIF files!
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
MotionGIF - An all-in-one, easy and feature-rich GIF animator for Web animation!