NimbleText - NimbleText is a text manipulation and code generation tool available online or as a free download.
GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
WordCounter.net - Count words, sentences, paragraphs etc.
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
Heytools - JavaScript tools, AJAX tools and some fully server side tools.
PP - A generic Preprocessor - P is a text preprocessor designed for Pandoc (and more generally Markdown and reStructuredText).