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.