Crumbles - Crumbles are like reaction GIFs with a way bigger vocabulary
Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
Rif - Product Hunt for reaction GIFs
Askey - Turn your drawings into text & emoji on iOS!
Mematic - Mematic – Make Your Own Meme is another free to use meme generator application developed and published by Trilliarden.
Pattern - Simple, focused, drawing application for the iPad.