This Notepad++ plugin is simply a front-end to GTags (GNU Global source code tagging system):
http://www.gnu.org/software/global/global.html
It provides tools for easy code navigation.
GTags binaries (Win32 ports) are needed by the plugin. Those are supplied with it for convenience.
s2html is a C/C++/Java/Lisp HTML source code converter.
s2html is a very simple C/C++/Java/Lisp HTML source code converter. It uses embedded CSS to format your code. Many other formatters exist, this one started its life back in 1983 as my very first C program.