NOTE: THIS ADDON WILL NOT WORK IF YOU DON'T HAVE THE ASSOCIATED APPLICATION RUNNING. READ BELOW BEFORE DOWNLOADING.
The source code for the application can be found in the addon's folder. The application itself and setup instructions can be downloaded from here:
This addon will allow you to open links in your web browser from in game. It will do so without modifying any of WoW's code or accessing any of the game's RAM or anything like that. It'll communicate with a small application (one way communication from addon -> application) by changing the color of a few specific pixels and using those color changes to send the characters.
It could be argued that this falls in the grey area of the ToU so I'd recommend that those who are concerned about this steer clear. However, there will be no communication from the application to the game so there is no chance of it being interpreted as a program which is automating actions in the game. Also, it will not open any links without an explicit confirmation by the user (via a slash command).