Watermark.ink - Online Photo Watermarker
GIPHY for iMessage - The easiest way to share all the GIFs in all your txts
textmark - Protect your content with an invisible, trackable watermark.
Doll Up Stickers - Dress up your messages.
AG Audio Watermark Generator - AG Audio Watermark generator is a little app for both mac and pc that will help you to add an audio watermark to your original track in a fast & easy.
Bobble Stickers for iMessage - One selfie, Unlimited Stickers!