TisaneAPI - Detect hate speech, cyberbullying, and more in 27 languages
Ring4 Meeting - Dead simple video conferencing - free, in browser
YouTube Kids - YouTube for the youngins on iOS and Android
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.
Interland by Google - A game to help kids be safe, confident explorers online
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.