GNU GLOBAL is a source code tag system that works the same way across diverse environments. Currently, it supports the following:

o command line, and the 'globash' query subshell. o vim plugin, and support for other vi clones. o less o emacs o web browser

Supported languages are C, C++, yacc and Java. You can locate a specified function in the source files and move there easily. It is especially useful for hacking large projects containing many subdirectories, many '#ifdef' and many main() functions, like X or kernel source.

Doxygen now supports using global as its source browser, with the USE_HTAGS option.