warframe, spiral knights?
edit: most of these games should have drops (i think path of exile doesn't have any though).
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There's no item drop in Warframe (if you mean items in Steam inventory).
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Played ARK Survival Evolved back when it was in free weekend, and it added an item category in my inventory. I have no idea what kind of item you can receive in there, or even if you can drop items in it.
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Many more games since this post was made has added/removed inventory items to Steam, to keep up with them I have made a guide on Steam.
http://steamcommunity.com/sharedfiles/filedetails/?id=873140323
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http://steamcommunity.com/market/
almost all these
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Don't Starve Together
http://store.steampowered.com/app/322330/Dont_Starve_Together/
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Here is some games I know with item drop:
Please, continue this list.
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