The "Tag List" plugin is a source code browser plugin for Vim and provides an overview of the structure of source code files and allows you to efficiently browse through source code files for different programming languages.
The github page for the taglist plugin is at:
http://github.com/yegappan/taglist
You can visit the taglist plugin home page for more information:
http://vim-taglist.sourceforge.net
For more information about using this plugin, after installing the taglist plugin, use the ":help taglist" command.