SlackDeck

Slack is the best tool for team communication now but there is no easy way to have several Teams open simultaneously. SlackDeck is a simple tool that allows you to open as much Teams as you want. Tip: To rearrange tabs, just drag one on a position you want. Not affiliated with Slack. --- Changelog 1.1 - change "Add new tab" button appearance. A window will remember the size and its position and restore the state later. 1.0 - Initial release

Screenshots from Chrome Web Store