Recime - Create smart chatbots. Zero code required.
Dialogflow - Conversational UX Platform. (ex API.ai)
BotList - An app store for bots
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
Swat.io - Plan and approve your content marketing strategy – Streamline your community management.
Botkit - Botkit is an open source developer tool for building chat bots, apps and custom integrations for major messaging platforms.