Dialogs by Slack - Build interactive forms in Slack that do all sorts of things
Slack - A messaging app for teams who see through the Earth!
Slack Voice Chat by Standuply - Easily record and send voice messages on Slack 🗣️
9mCollab - Collaborate (efficiently) Conclude (fast) Contribute (in the knowledge base)
Mattermost - Mattermost is an open source alternative to Slack.
Holberton School - High-quality software engineering education for the many