Ring4 Meeting - Dead simple video conferencing - free, in browser
Onionshare - OnionShare lets you securely and anonymously share a file of any size with someone.
Fellow.app - A manager’s co-pilot for 1:1s, meetings, feedback & goals 🚀
ShareDrop - HTML5 clone of Apple's AirDrop - easy P2P file transfer powered by WebRTC
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.
Send Anywhere - Send whatever you want, wherever you want