Conversity - Easiest way to manage Facebook Messenger chats
DogeHouse - Open-source audio chat on the web.
Slack with your Users - Speak to your app's users entirely within Slack
Cozyroom.xyz - A group chat with simple avatars and geo location
Talkus - Chat with your website users from Slack
Walkie - Walkie is an online communication providing software that allows you to remain in touch with the other persons.