GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of preprocessing tasks. Its independence from any one programming language makes it much more versatile than the C preprocessor (cpp), while its syntax is lighter and more flexible than that of GNU m4. There are built-in macros for use with C/C++, LaTeX, HTML, XHTML, and Prolog files.
The latest stable version of GPP is 2.24, released on 2004-09-19. A list of changes from previous versions can be found in the change log.
The source code can be found at https://github.com/logological/gpp/.
Binary packages are available for several systems:
You can browse through the online HTML documentation. The source distribution includes the documention as an HTML file, man page, and LaTeX document.