Lively - Make GIF and short movies from your live photos.
Ralpha Image Resizer - High-speed image batch conversion tool
GIF Brewery by Gfycat - Create stunning GIFs from videos & screen recording for free
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Flip - A seamless way to capture looping videos on mobile 🎬
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.