GIPHY for iMessage - The easiest way to share all the GIFs in all your txts
My Ninja Stickers Pack - Showcase your inner ninja!
MojiLaLa Unlimited for iMessage - 32,000 original stickers by 450+ artists all over the world.
Bitmoji - Turns your avatar into stickers and emoji
StickerPop API - Embed all the best stickers and GIFs into your apps.
Giffage - Create, edit, discover, and share GIFs from your keyboard