Botpress

Botpress is the leading open-source chatbot stack, allowing developers to build better chatbots without a team of data scientists and machine learning experts. First released in 2017, the Botpress platform includes a unique managed NLU engine, an integrated development and visual conversational design environment, flexible integrations, and extensive options for customization. Developers love Botpress, and the product has more than 9500 Github stars and 100,000 users. The company is privately held and headquartered in Quebec, and recently closed a series A funding, led by Decibel.