TaglistToo is a vim plugin which provides an outline, or taglist, of a source file in a separate window allowing you to quickly get an overview of the file you are working on and to quickly jump to class definitions, methods, functions, etc.
TaglistToo is very similar to the very popular taglist.vim written by Yegappan Lakshmanan, but with a focus on being extensible and customizable. TaglistToo provides hooks allowing you to format the taglist content per file type and to also write code to parse file types not supported well or at all by ctags.
Please note that TaglistToo requires that vim be compiled with python3 support and that you have exuberant ctags installed.
Please see the vim help file for full documentation.