Slackmojis - A directory of the best custom slack emojis
Emoji Maker - Create custom Emoji based on Twemoji
Discord Emoji - Iconfinder, but for emoji.
Emojidex - Emojis-as-a-service
Emoji Builder - Create your own emoji in no time 💨
Mojipic.app - When a couple emoji can't convey how you feel.