Zoolana is a meeting app that uses the Solana blockchain as a signaling server to establish p2p WebRTC calls.
WebRTC enables p2p communication between browsers but the two browsers still need to find each other on the internet. For this, a signaling server is used to which both parties send their browser info. Zoolana uses Solana as a signaling server, creating an always online and free to use (apart from tx fees) signaling server.
This is the repo for the frontend for zoolana.com, go here for the program.