Movie Collection Database Programs?

I'm looking for a program (preferably an app although nothing I found seemed exactly right) where I can catalogue our movie collection and assign the movies custom tags that I could search. The ones I've found let me sort by predetermined genres, but I'd like to search by "light," "feel-good," "dark," "nolstagic," etc. Often times it takes far too long to pick a movie from our ever growing collection and these tags would be helpful.