I was very chuffed to find that Warzone 2100 (RTS game) is now free and portable (at PortableApps.com). I bought that one when it was new so looking forward to revisiting it. The games section at PortableApps has a pretty good selection of free stuff.
I also discovered lately that Total Eclipse (first-person adventure set inside a pyramid, I first played it on my Atari ST) has been ported to PC and is free if you google Ovine Total Eclipse).
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