My Game Design Document can be found at this like here.
I have used Dundoc to set up my game design document. I used the starter game temple that was available. The document will have live updates so it will expand as I progress with my project. I like having the GDD so my information is all in one place. Dndoc is well laid out and easy to navigate.
This is what the dundoc looked like when I first created it. (screenshot)
