Third party guild hosting site, Enjin, is offering a supported product called “Overwolf”. It passes the third party test listed in your sticky about unobtrusive software, since it provides no game advantages and doesn’t utilize any GW2 programming to function. It simply allows use of browsers, guild sites and chat functionsscreen shot and video captures without having to leave the game screen via a floating display overlay, for lack of a better term.
Is this a product that would be a bannable offense? Enjin is the host of the bulk of your guild sites. It would be worth the 30 seconds of your time to look at it, since it will probably be widely used soon. Check it out at enjin.com or overwolf.com. Thank you and I await your reply.