An interpreter that takes PostScript input and produces native printer language output for various non-PostScript printers. An X image viewer supporting many file formats and image manipulation functions. XPilot A multi-player network game. If you don't have access to the HP ANSI C compiler, there are still options. The next most important tool to have when building software from the InterNet is gzip.
Most software is distributed in a compressed tar file.
This article can't cover how to build all available software, but at least general information on building and installing is included with the software. These scripts will search the computer to find libraries that need to be included and macros to define for the compiler. You may have to modify a header file or change flags in the Makefile to configure the software before doing a compile. Most software assumes that cc runs as an ANSI compiler. If all goes well, the end result will be an executable copy of the program.