source-highlight

GNU Source-highlight, given a source file, produces a document with syntax highlighting.

Source-highlight reads source language specifications dynamically, thus it can be easily extended (without recompiling the sources) for handling new languages. It also reads output format specifications dynamically, and thus it can be easily extended (without recompiling the sources) for handling new output formats. The syntax for these specifications is quite easy (take a look at the manual).

Source-highlight is a command line program, and it can also be used as a CGI.