DogeHouse - Open-source audio chat on the web.
Mightybell - Build a community and a business on mobile
Cozyroom.xyz - A group chat with simple avatars and geo location
MyTalk - Build a community around your product
Walkie - Walkie is an online communication providing software that allows you to remain in touch with the other persons.
Hey.Cafe - Hey.Café is a social network built around communities called cafés.