Image brush used by the GNU Image Manipulation Program (GIMP), an open source image editing application; stores the description, bitmap image, and the spacing for the brush; used for storing graphics that can be repeatedly painted on a GIMP image canvas. GBR files are used to store both the default program brushes as well as custom user brushes. Some default brushes are located in the /share/gimp/2.0/brushes/ directory of a GIMP installation.
The GBR extension is used in printed circuit board (PCB) applications and technology to signify Gerber files, an industry standard file format for PCB designs and related computer assisted design (CAD) programs. GBR files can be edited with the appropriate software.