BuddyPress.org

http://buddypressdev.org/phpxref/nav.html?_functions/index.html

That is a complete list of every function in buddypress, along with location of code and places where it is referenced.

As far as your request for a function which returns groups created by a particular user, what did you need the list for? and where did you want to use it?

Hopefully that helps.

Brad