For the next 24 hours, the Humongous games are on a Humble Flash Bundle!
$20 for the Complete Pack is an absolute steal (less than $1 per game!) and they are all available DRM-Free!
I'm pretty bummed I missed out on this. I just got a sampler pack from BundleStars for $3.99, but sadly only Steam keys.
Are any Humongous games still available DRM-Free anywhere? GOG, if you are listening and have a change of heart...
I believe buying them digitally from Amazon nets you a DRM-Free copy. Also I know it's not ideal, but once you download the games from Steam they have no other DRM on them and you can use them as you wish.