Hamster Pad - A social network built on top of Slack
Butter - Butter is a newly launched chatting application that focuses more on the privacy of its users.
sup3rS3cretMes5age - A safe, simple tool for one-time (self-destructing) messages
Founders at Work - Stories of successful founders
Tsu - Social that pays
Kwayet - Team chat & collaboration app, a simple way to Slack