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

BotList - An app store for bots

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

Slack App Directory - Your go-to for finding apps that work with Slack

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

ChatBottle - Chatbots Search Engine