ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Gifox - Delightful GIF Recording and Sharing App for macOS
Ralpha Image Resizer - High-speed image batch conversion tool
Instagiffer - Create GIFs from anything!
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats