showFoto - ShowFoto is the standalone image editor of the digiKam project.
ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
PixBuilder - Free Photo Editing Software for PC
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Instagiffer - Create GIFs from anything!