WorldChat - Meet new people around the World on WorldChat.tv, the Original World Chat since 2011.
Send Me Color! - With Send Me Color! you can send a hint to your contacts that will look like color card.
Briar - Secure messaging, anywhere
Partey.io - Invite to parties and events. Dead simple, privacy-first. Just send a link to your friends. No accounts needed!
The Serval Mesh - It works by using your phone's Wi-Fi to not communicate with other phones on the same network.
Push Party - Push Party is an exclusive, invite-only social network