Slackin - Create your own public Slack chat community
Kaboom by Hotspot Shield - Share messages & photos that disappear on any social network
Mio - Powering seamless communication between workplace chat apps.
Tsu - Social that pays
Chats.Directory - A curated list of the best Slack groups for professionals
Hey Load Generator - HTTP load generator, ApacheBench (ab) replacement, formerly known as rakyll/boom