I've been using a relative's computer recently in lieu of my own. Unfortunately, I developed a mapping itch a few days ago. I don't want to download the ~15 GB of files needed to run Steam and Team Fortress just so I can use Hammer, so I'm looking for a standalone version. I don't need to run maps, I just need to make and edit VMF files. I've already looked at Hamr Online and VMFSketch, but these are "prototyping" tools. I would prefer the full Hammer experience, or at least as close to it as I can get, without needing to download nearly 20 GB as a prerequisite. If it comes with TF2 content, even if it's only the most commonly used textures and models, then that's all the better. If one doesn't exist, how difficult would it be to create one?