Sblack makes Slack for Mac easier on your eyes. Just drag and drop and you're doneʉϬ

Download Sblack is no longer available for download since the app is in violation of the Slack Acceptable Use Policy. It was fun while it lasted, sorry guys!

If you like cool things with black themes please check out Boxy.
Hey! We've just released a beautiful Twitter client for Mac 😱 The code is open source on GitHub Version 1.0.1, macOS 10.12 or later required - Original CSS by Jonathan la Cour