Neatro - Neatro is the online Agile retrospective platform designed to help teams improve continuously.
Ring4 Meeting - Dead simple video conferencing - free, in browser
Metro Retro - For productive, engaging and fun retrospectives
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.
Retroly - A fun simple tool for agile retrospectives
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.