Spirit - The animation tool for the web.
Ralpha Image Resizer - High-speed image batch conversion tool
Lottie by Airbnb - Easily add high-quality animation to any native app
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Haiku Animator - Create powerful animations for any app or website
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.