Several years ago, I got hooked on a command line script called ps2pdf. I used (and still use) it extensively to convert Postscript files to PDF. You can learn more about ps2pdf here.
The main problem with ps2pdf is that to use it fully, you need to remember a lot of command line options. And those options aren't always concise. For years, I wished for an easy-to-use GUI for ps2pdf. Someone was listening, because they put together a nice graphical front-end to ps2pdf called Moonshiner (an obvious play on Adobe Acrobat Distiller, a Mac and Windows application for generating PDFs).