ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Bobble Stickers for iMessage - One selfie, Unlimited Stickers!
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
GIPHY for iMessage - The easiest way to share all the GIFs in all your txts
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
MojiLaLa Unlimited for iMessage - 32,000 original stickers by 450+ artists all over the world.