Wood for styles and rails (calculate this based on the size and number of doors).
(style refers to the vertical pieces, rails mean the horizontal pieces)
Dowels for the joints (in my case I used 8 1/2" x 3" per door)
Blue painters tape
2 part epoxy resin glue and microfiber thickener.
Warning this method of making doors uses sloppy fit dowels to compensate for a large degree of misalignment, based on my not having a horizontal drill press to properly align the holes. you must use a glue that gets its strength from a wide glue line, as far as I know epoxy is the only way to accomplish this. using any other kind of glue will result in failure.
Chop saw or radial arm saw
Sander (I prefer a DA but a belt sander in experienced hands will do)
Drill press (big enough to fit you longest rail on end). I think you might be able to get away with using a hand drill with this sloppy fit system.
4 clamps (wide enough to clamp the width of the door)
mallet (to help align the door, when gluing up)
hammer and 1" chisel (to mortise the hinges)
Lock boring jig, also called a lock installation kit (Harbor Freight about $10.00)
Boat builders slick (optional, I use it because its one of my favorite tools)