Talkus - Chat with your website users from Slack
Sociall (Beta) - A secure and private decentralised social network for all.
Chatlio - When you have a business to run, your average instant messaging software just will not do. You need an internal presence upon which your entire team can collaborate on. Read more about Chatlio.
Planetary - Decentralized social media by and for the people.
Slacking Pigeons - Chat in real time with your users directly from Slack
Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!