Slackmojis - A directory of the best custom slack emojis
Mojirater - Emoji reactions & social share buttons for your site
Discord Emoji - Iconfinder, but for emoji.
Reaction Packs for Facebook - Swap out Facebook reactions for something a little more fun.
Emoji Builder - Create your own emoji in no time 💨
Emoji Maker - Create custom Emoji based on Twemoji