This is a super simple WebKit wrapper around Slack to run it in Safari instead of Electron. The hope is that this will use less power than the electron version (at the cost of fewer features). It supports drag-n-drop file and open links.
Your mileage may vary.
The entire code is in ViewController.swift (plus a few lines in AppDelegate.swift to close when the window is closed) and is around 200 lines long total.
The icon comes from Elias' macosicons
Notification support is hopefully upcoming but not tested yet.
Use at your own risk, but it's an extremely simple app, so you can easily audit the code yourself.
LICENSE:
All content in this repo is public domain, except the icon, which is subject to the license of Elias' macosicons, which is GPLv3.