Snackshots for Messenger - Create your own stickers in a few taps
Antiselfie club - Take a photo and get a antiselfie.
MessMoji - Emoji stickers for iMessages
Dango - Use emoji, stickers & gifs faster 😄 💬
SLMMSK - Antiselfie app
StickerPop API - Embed all the best stickers and GIFs into your apps.