By far one of the most useful tools I've ever come across this piece of software is worth every penny.
Basically a database, it allows you to keep track of every kit you have ever purchased down to where in your home it is kept. Why would you do that? Well, I can think of at least two practical reasons right off the bat; 1.) No longer buying multiples of the same kit because your stash is so big, you don't remember already having multiples of the same kit. 2.) Don't straddle your loved ones with a bunch of what they see is "crap" that can actually be worth a lot of money.
I know the second one may sound morbid, but I can't tell you how often I have seen kits go for pennies because the children of a collector had no idea what they had. Model kits can be worthless, but they can also go for big bucks if its a desired kit in great shape. There are also many people out there (like me) who will pay because they really want that kit to complete a collection and you just see the numbers go up. This database allows you to enter what you paid for the kit, and even what it is worth today - should you be so inclined. You can categorize your kits - plastic, metal, resin, armor, air, etc. and best of all, you can customize fields - so you aren't limited to what the SW designer put in.
When all your kits are entered, you can produce reports that let you further categorize what you have. I have found it quite handy to print and even if I'm not home, I can look at my list to see if I have a kit before I bid for it and end up duplicating my stash.
The database even lets you include photos, making it even easier to keep track.
Now it isn't all automated, and it does require work on your part - just like any database would - BUT once you create fields, for example they are always there. In time, all you have to do is enter the kits as you obtain them.
It's not often you come across useful SW for this hobby. Most of the time the apps or packages are based on something else and are very limited, or they are just plain dumb. I suspect the developer of this database is actually a hobbyist because of they way it's designed and I would highly recommend it to anyone who wants to keep track of their stash.
You can check out and buy the Kitbase here. It retails for $44.99 USD.