GIPHY for iMessage - The easiest way to share all the GIFs in all your txts
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Doll Up Stickers - Dress up your messages.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Bobble Stickers for iMessage - One selfie, Unlimited Stickers!
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats