software for storing chess tactics?

Is there such a software that stores tactical puzzles and lets you solve them? I want to take The Ultimate Chess Puzzle Book and make it electronic. Sorta like converting it into a CT art-like program.

I started storing tactics in Chess Position Trainer. I didn't get really far but there are some features of the program that work really well with training (tracking of scores especially).

I would really like to find one that you could put tactics into that would combine with an engine so that each time you get the tactic you might get a different continuation from the losing side. Make you prove you understand the idea of the tactic and why weaker replies really don't work. I've seen a lot of tactics here on Tactics Trainer that I didn't get because I was worried about one of the variations; I would like to see why those replies don't work too.

I'll have to check out the SCID options too. I use it and have played around with the tactic database, though it actually took me a while to figure out how you can make your own tactics databse. Still haven't done it but I'm pretty sure I can do it.

Well, from what I understand, you have to have the positions but I think you have to bring up an engine, choose the annotation option and have the "Mark Tactical Exercises" checked.

I know that just having a database of positions didn't work the last time I tried it. I'll have to grab the database I have of Lazlo Polgar's checkmates and see what I can do to get it to work.

I think that chess hero can be used just like a tactics trainer on the web, except for timing and scoring.