Off the top of my head:
- Fret puller
- Fret end nippers
- 3 corner file with smooth edges for finish filing fret ends
- Fret crowning file (or, the 3 corner file can do double duty if you've got the touch and patience)
- Mill file to rough file fret ends
- A flat surface with some mass/heft to it for truing up fingerboard (piece of marble threshold, large jack plane, etc) and to level frets
- Assorted fine grade sandpaper, doublestick tape, etc
You should anticipate needing to replace the nut as well - you can get by with an assortment of needle files, or you can drop some extra $ on a set of nut files. Buy a few nut blanks - they're fairly cheap, and you're likely to not get it right the first time.
This is one of the better refret pictorials I've found, but there are many others out there. Plow through a few take plenty of notes before ordering anything.