PNM Image Editor Downloads
PNM ("portable anymap format") is a collection of graphics formats from the Netpbm exchangeable format family. It includes the portable pixmap format (PPM), the portable graymap format (PGM) and the portable bitmap format (PBM).
This set includes several image editors that allow you to open and edit PNM files.
PNM Image Editor download selection by Bill White. March 23, 2015