Chumpu iMessage Sticker Pack - Animated Chumpu cartoon stickers for iMessage
Emoji CSS - Add Emoji's to your website
StickerSDK.Mojitok.com - In-app store of animated emojis, GIFs, and stickers with personal curations for 10x engagement and revenue - as seen on Samsung Galaxy.
Discord Emoji - Iconfinder, but for emoji.
Sticker.Place API - Get stickers for your app
Slackmojis - A directory of the best custom slack emojis