"It's for Mac, and it's DRM free. (i.e. not for Steam)"
Actually Steam does have a few DRM-free games. Just say that you have a non-Steam game on Gamersgate and we'll understand.
Steamgifts is for Steam gifts and Steam gift keys, so you usually can't submit anything else (there are exceptions - for example, Steam keys for Humble Bundles are forbidden here but unredeemed gift URLs are allowed). I can think of a couple of options:
Don't forget to make sure that the game you have on GamersGate is actually giftable.
I don't have a mac so I won't be entering, but thank you for being thoughtful with your extra game and for being careful about not breaking the site rule.
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sitting in my GamersGate account. It's Cities in Motion for Mac, non-Steam. So, I guess I wouldn't be allowed to make a givaway for it even though it exists on Steam, right? (Post edited for clarity)
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