I know with Mac OS X Versions lower then Sierra, you can edit the Info.plist
file and add:
<key>LSUIElement</key>
<true/>
Right above this:
</dict>
</plist>
If I do this in Sierra, the app won't run. Has anyone figured out how to hide a running application from the dock?
I used the following and it worked
<key>LSBackgroundOnly</key>
<string>YES</string>