Neko Amino - Neko Amino is an excellent platform that brings video games, discussion, and roleplay, etc.
ColdCast - An open social network with zero corporate interference.
Live Chat Rooms - Live Chat Rooms is one of the best chat apps that allows you to communicate with thousands of people around the world.
ZeroMe - Social network for the distributed P2P network ZeroNet.
Furry Fandom - Furry Fandom is a roleplay, socialize, and chat app developed and published by Fan Messenger.
GNU social - GNU social is communication software for both public and private communications.