mooDex
Like a box of index cards.
mooDex fills the gap left by Casady & Greene, Inc.'s QuickDEX. It opens and saves QuickDEX files, displaying them similarly to QuickDEX.

Like a box of index cards, mooDex can be used for anything from addresses to recipes. The simplicity of mooDex is what gives it it's elegance.

The interface in mooDex is somewhat more intuitive than QuickDEX, adding OS X's user friendly interface elements.

Download mooDex v3.5

mooDex is shareware, $7 (US).
You can try it for free without limitation, but if you find it useful, please pay for it.
You can register from within mooDex, or by clicking here.