This article explains how to convert custom Adobe Photoshop brushes from ABR files to PNG files so they can be used in other graphics programs. Additional information covers using Photoshop brushes in GIMP.

Use ABRviewer, an open source program that converts ABR files to PNG format, to import custom brushes into the software of your choice:

Open ABRviewer and select File > Open Brush Sets.

Select an ABR file and select Open.