Grargar: <span class="bold">Humble Sierra Bundle</span> $1
Space Quest® Collection
Police Quest™ Collection
Arcanum: Of Steamworks and Magick Obscura
Quest for Glory 1-5
Gabriel Knight 1-3 $15
Geometry Wars 3: Dimensions Evolved (Also for Mac and Linux)
King's Quest Collection (1-7)
Velocity 2X $20
King's Quest: The Complete Collection
All games require a Steam account.
I'm assuming though, that since these are all old games, they'll probably be through dosbox, meaning that they are DRM-free once you've downloaded and installed them off steam.
As an aside, are GK2 and Timeshift (the only two games in t2 that I don't own) worth $7.43?