*NIX Ripping Solutions For Plotters

haogemenr writes: "I work in an all Apple architecture firm, but we have a Linux box that primarily functions as a DSL router. The options for large format plotter drivers in the Macintosh world are few and relatively expensive. PostScript output devices are a great, but expensive solution and HP doesn't provide any Mac-friendly drivers for non-PostScript plotters. What are the *nix solutions? You can write PostScript from CAD application using a generic PostScript driver, but converting PostScript to an RTL file or HPGL2 file is necessary for lots of older plotters. I've heard of an application named makertl, but I haven't been able to find it anywhere. What do Unix folks use for large format image processing?"