I unexpectedly had to reinstall my game and decided to try to organize all my custom content, and I have a lot. Quite a while back I had read something about a custom content installer, but at the time all my stuff was installed so I didn't need it and promptly forgot about it. From what I remember this was a program that you could load your CC into, and then you could pick through what you wanted and didn't want, and then load just that content into your game. The programs I've found this time around (CC Magic, Sims 3 pack cleaner, Custard) don't seem to fit what I'm remembering. Does my description sound familiar to any of you? Or am I just not using any of these programs to their best use?

That should be CCMagic. What you're describing are different configurations.