Multiple installs of the same application?
You can do this with Reeder. 


You will need as many user accounts as you have Google accounts. 
Supposing you have 2 Google accounts, you can obviously run your main Google account as the default user. Just click on Reeder from Launcher or Dock and you are good to go. 
Go to System Preferences, Users &amp; Groups, and create a new user. Call it TestUser. Make sure you set a password. A standard user account would do.
Open Terminal. 
execute this: echo "password" | sudo -S -u TestUser /Applications/Reeder.app/Contents/MacOS/Reeder &amp; 


voila! You can now see a 2nd Reeder window!