Tars - TARS enables users to create chatbots that replaces regular old webforms.
Voxer - Turn your phone into a Walkie Talkie. Don't waste time on phone calls and voicemails.
Phonexia Voicebot Suite - Phonexia Voicebot Suite is an all-in-one voicebot-building solution for the rapid, on-premise development of highly sophisticated conversational AI interfaces for contact centers and other automated systems.
Sameroom - Chat interoperability-as-a-service
Dialogflow - Conversational UX Platform. (ex API.ai)
Chromacam - Chromacam is a tool that offers virtual green screen for web conferencing and presentations.