Voiceflow - Build voice apps in your browser without coding
Ring4 Meeting - Dead simple video conferencing - free, in browser
API to bot - Convert your API to Alexa skill or Google Home app in 5 mins
Stork.ai - AI-Based Collaboration for Hybrid Teams. Rich media messaging, advanced video and voice conferencing, auto-transcribing and screen sharing. Serendipitous meetings at the water-cooler with your human and AI teammates.
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.