There is an addon, I will look for it assuming someone else doesnt link it in the next minute.
Or... its a sticky lol
http://www.steamgifts.com/forum/ba6uc/sg-enhancement-addon/page/31337
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Since Steamgifts already require you to refresh your games, and thus has a list of what you already have, it seems to me that it would be a simple thing to implement a function to filter out games you already have from the list of active giveaways.
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