Dialogflow - Conversational UX Platform. (ex API.ai)
Chat Bots Weekly - A weekly curation of everything important in chat bots
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
Botkit - Botkit is an open source developer tool for building chat bots, apps and custom integrations for major messaging platforms.
BotFunded by botlist - Track which chatbots are getting the most funding
Botpress - Open-source platform for developers to build high-quality digital assistants