Posted February 05, 2015
I have it from FireFlower but haven't installed it yet. According to that link, the DRM-free build is exclusive to them. No DRM-free symbol on the bundle page, but Desura claims on the game page it is DRM-free.
pablodusk: I'm not sure Zigfrak is even DRM-Free on Desura (maybe someone can confirm). See this post.
IAmSinistar: I have it from ShinyLoot, where it uses "Online One Time Key Validation". Probably the same (at minimum) on Desura.