CAM for plasma

I have noticed there are several 2D and 3D cam programs being developed for use with Ubuntu and EMC2. Without having to download them all and try them out does anyone know of any that would be good for use with a plasma table. Specifically I am looking to have the ability to edit the post processor to suit my needs and have control of lead in and over-cut (cutting past the start point). I would also like the ability to do a round of piercing, then swap consumables for some fresh ones and then proceed with cutting the parts. It's not a big deal on thinner materials, but the thick stuff really chews up the consumables. If I could use some junk tips for the pierces and then go back and cut the parts out afterward I think that the consumables would last quite a bit longer. On the big torch we use at the shop the boss said it costs $50 every time we swap them out.

Any ideas for a cam program that will do that would be greatly appreciated. It would really be nice to have something on the plasma table computer for creating simple parts on the fly. At the moment, I am still running over to the windows machine to do even the simplest of tasks.

Looks like ngcgui will be handy to use once I get the hang of it.

I will look at sheetcam a little farther. Maybe he has an idea for the post processor that will allow me to do a round of hole piercing with out doing the rest of the cutting. So I would just end up with two gcode files for a part as apposed to trying to make it all happen in one file.

I will see if there is a manual available for download, it may be something simple enough that i can create the post processor myself.