[lug] PCB Layout Software? Gerber RS-274X

[stimits at comcast.net]

I need to open some circuit board designs in linux, and although there seem to be design programs out there I'm having problems finding one that reads the particular files I have. The files are listed as RS-274X format, and have these extensions on file names:
*.drl
*.pho
*.lst
*.ppm
*.rep

Does anyone here know of or have a favorite PC board program that can directly import or use these? I'm using fedora if that helps.

Thanks!
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