I am going to make a comic

Indeed. I am going to make a comic using Photoshop, Garry's Mod and one other program. All I have at the moment is a poorly done concept image setting the setting. behold:
Ofcourse, the actual end product will look way better, just did this picture quickly to post it quickly. The comic will be a crossover between TF2 and WoW. This is all the teasing I have for you, the story and such will remain secret till I post the first section of the comic. By the way, can you guess the third program used?