PP - A generic Preprocessor Alternatives

The C preprocessor implements the macro language used to transform C, C++, and Objective-C programs before they are compiled. It can also be useful on its own.

GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of preprocessing tasks.

GNU M4 is an implementation of the m4 macro preprocessor. Developed by the GNU Project, GNU M4 is designed to avoid many kinds of limits found in traditional m4 implementations, such as maximum line lengths, maximum size of a macro and number of macros

Gema is a general purpose text processing utility based on the concept of pattern matching. In general, it reads an input file and copies it to an output file, while performing certain transformations to the data as specified by a set of patterns defined by the user.

filepp is a generic file preprocessor. It is designed to allow the functionality provided by the C preprocessor to be used with any file type. filepp supports the following keywords, all of which have their usual C preprocessor meanings and usage.

A variation on the C preprocessor that (1) works on multiple languages and (2) encodes preprocessor statements as comments in that language so syntax correctness is not broken.

The build preprocessor is similar to the C preprocessor, meant for processing files which have no built-in preprocessor such as XUL and JavaScript documents.

A small yet powerful text processor in Python.