Re:Slack for Linux – Help Hack on This
by jess1003 on Monday December 15, 2014 @02:23PM
(#8753796)
Check out Hall for business messaging. Has a Linux, Mac, Windows, iPhone/iPad, Android, & web apps. All free, with unlimited members, groups, integrations, and history. https://hall.com/download-hall/hall-for-linux
Given the premium price of Slack compared to alternatives I'd have expected that they were the one developing a Linux client