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Check out Connecter from Design Connected - free, modern looking and very capable 3D asset management app.
i tried using them a while ago but it didn't work well after a few thousand models.
also their site is down currently!
Well, there are few other alternatives, both commercial and free ones, but i didn't tried them, so i can't recommend anything. Connecter works well for me, but i have relatively small model library, so i don't know how it handles thousands upon thousands :]