Dialogflow - Conversational UX Platform. (ex API.ai)
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
ProcessMaker - ProcessMaker is an easy to use BPM and workflow software solution. It is used to design, automate, and deploy business processes of any kind.
Botpress - Open-source platform for developers to build high-quality digital assistants
Microsoft Power Automate - Microsoft Power Automate is an automation platform that integrates DPA, RPA, and process mining. It lets you automate your organization at scale using low-code and AI.