Slack - A messaging app for teams who see through the Earth!
Slite - Your company knowledge
MailClark - The Slack bot for external communications
Docusaurus - Easy to maintain open source documentation websites
Mattermost - Mattermost is an open source alternative to Slack.
Tupple - Available on IOS, Tupple is the virtual friend that recommends topics to share and lets you create together on the world's first vertical + horizontal social feed.