I have accounts on steam, GOG and amazon. Whenever I see a deal, I sometimes need to log into all three of those accounts to see if I don't already own that game. I know, my memory's THAT bad. I was thinking of making a central database of my game library. Is there some way to extract the names of the games from all three accounts without having to manually copy/paste? With almost 200 games, I can see a really boring weekend ahead of me. Any help?
EDIT: A Steam copy of Batman Asylum GOTY for the best answer! (I have an extra Steam product key lying around from a deal)