Slackmojis - A directory of the best custom slack emojis

Dialogflow - Conversational UX Platform. (ex API.ai)

Mojirater - Emoji reactions & social share buttons for your site

Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Keybase for Chrome - A secure chat button for every profile

Botkit - Botkit is an open source developer tool for building chat bots, apps and custom integrations for major messaging platforms.