ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
All the GIFs - Search all the GIFs right from your Mac
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Twif - A bot that replies with relatable GIFs on Twitter 🐦
Ralpha Image Resizer - High-speed image batch conversion tool
YouTube GIF Creator - Turn any video into a GIF directly inside YouTube