Here is a very cool Fate dice roller that can be used during hangouts. Really well done. Does not support retina displays perfectly, but otherwise is ideal. It can be the missing piece needed to make running Fate Core online using this site for all character and game material management pretty much complete.
In addition, a fantastic whiteboard used for drawing zones and even tracking situational aspects is listed below in the links section. This product requires registering for a free account, but is a small price to pay. Also sometimes the hangouts thing causes you to open another tab, so you need to mess with it a bit and don't try and save and reopen your drawings, and login before you start the hangouts.