For about a week, Humble has special discounts of some DRM-free games on their store. That is, you download the game and it’s unconditionally yours – no Steam, no UPlay, no EA Origin, no Games for Windows Live (ugh, flashback) or whatever.
To give you some ideas :
Games that have writeups.org material:
Games that I hope to write writeups.org material for:
Satellite Reign, Grimrock, Sunless Sea, Xenonaut, Shadowrun, Metro.
Cool stuff but not writeups.org-related:
Tacoma, Kentucky Route Zero, Audiosurf, Gone Home.