Slackmojis - A directory of the best custom slack emojis
Dialogflow - Conversational UX Platform. (ex API.ai)
Discord Emoji - Iconfinder, but for emoji.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Emoji Builder - Create your own emoji in no time 💨
Botpress - Open-source platform for developers to build high-quality digital assistants