Excel and pivot tables is the easiest if you want to manage more than one type of item.
For video games I use Game Collector. Only cause I used it first before excel and it has images lol. I do export everything to excel though so I can keep it on my phone.
The company also does apps for books, movies, music and comics. Each is a seperate cost unfortunately. http://www.collectorz.com/
They do allow custom fields, So I assume if you could be bothered and had the time to do it in theory could customise your own database.