How to use Homebrew or Brew to install syncthing as a cask.

Syncthing as a Formulae vs Cask

If you do the following command

brew install syncthing

This command will install syncthing as a formulae, and therefore no AppTray (on OSX)

If you want the syncthing apptray icon on OSX then do this ...

brew uninstall syncthing
brew install --cask syncthing

On OSX -- Go to Applications folder using Finder and double click Syncthing. I believe installing using this method uses the syncthing DMG to install. Pretty sure.

You will see the Syncthing Apptray icon in the top row of the display. Open syncthing from the icon