FMPP is a general-purpose text file preprocessor tool that uses FreeMarker templates. It is particularly designed for HTML preprocessor, to generate complete (static) homepages: directory structure that contains HTML-s, image files, etc. But of course it can be used to generate source code or whatever text files. FMPP is extendable with Java classes to pull data from any data sources (database, etc.) and embed the data into the generated files.