Gerbv is one of the utilities affiliated with the gEDA project, an
umbrella organization dedicated to producing free software tools for
electronic design.

Gerbv is a viewer for Gerber RS-274X files, Excellon drill files, and
CSV pick-and-place files. It is a native Linux application, and it runs
on many common unix platforms. Gerbv is free / open-source software. The
core functionality of gerbv is located in a separate library (libgerbv),
allowing developers to include Gerber parsing/editing/exporting/rendering
into other programs.