Slack may refer to any of the following:
1. Slack is collaboration software for Windows, macOS, Linux, Android, iOS, and Windows Phone, launched in 2013. It uses a cloud service that helps teams, organizations, and communities accomplish tasks together and manage shared resources.
All communications are searchable and integrate with other services like Dropbox, Trello, GitHub, and Zendesk. The name "Slack" officially stands for "Searchable Log of All Conversation and Knowledge."
The Slack website is located at https://slack.com.
2. Slackware Linux is often referred to as Slack.