NedGraphics, Barco, Stork, Sophis, Electra, and others. However, the standard software from the graphics is being emulated, so many Textile Engraving Color Separators with experience in digital work are going to Adobe Photoshop and making spot color channels from RGB, CMYK, LCH, etc. The tools for editing are much more elegant than can be found in most modules from most companies who usually specialize for designing and coloring over color separating. I am going to Photoshop, myself and recommend this for you.
Tedious study pays of quickly.