GnuWin32: NetPbm 10.27 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. GnuWin32: NetPbm relates to Photo & Graphics Tools. The actual developer of the free program is GnuWin32. We recommend checking the downloaded files with any free antivirus. The program can also be called "GnuWin32 NetPbm". The most popular version among the program users is 10.2.
From the developer:
Netpbm is a toolkit for manipulation of graphic images, including conversion of images between a variety of different formats. There are over 300 separate tools in the package including converters for about 100 graphics formats. The goal of Netpbm is to be a single source for all the primitive graphics utilities, especially converters, one might need.
You may want to check out more software, such as GnuWin32: util-linux-ng-2.14.1, GnuWin32: GetText or GnuWin32: Id-Utils-4.0-2, which might be related to GnuWin32: NetPbm.