Ah, did any of those go with both Steamworks and DRM-free from the start?
Doubtful, considering that Steamworks age can currently be measured in weeks. That said, Dungeon Defenders has DLC, mod support, Steamworks support, and utilizes all the shiny bits that Steam offers, yet still was able to offer a DRM-free version for the last major Humble Indie Bundle.
And then there's Beat Hazard Ultra, which was recently released on Humble Bundle DRM-free, alongside a DRM-free apk for Android despite it's long existence on Steam and other closed markets.
Then there's Braid, Legend of Grimrock, Torchlight (the first one), SpaceChem, Super Meat Boy, Uplink... all have mod support, DRM-free releases and purchase options on Steam.
And all of those games had a budget far smaller than the income Harebrained made off of Shadowrun Returns' Kickstarter.