Modules
Here is a list of all modules:

Adaptors | Adaptors are functors that alter the signature of a functor's operator()()
bind(), bind_return() | Sigc::bind() alters an arbitrary functor by fixing arguments to certain values
compose() | Sigc::compose() combines two or three arbitrary functors
exception_catch() | Sigc::exception_catch() catches an exception thrown from within the wrapped functor and directs it to a catcher functor
hide(), hide_return() | Sigc::hide() alters an arbitrary functor in that it adds a parameter whose value is ignored on invocation of the returned functor
retype(), retype_return() | Sigc::retype() alters a sigc::pointer_functor, a sigc::mem_functor or a sigc::slot in that it makes C-style casts to the functor's parameter types of all parameters passed through operator()()
track_obj() | Sigc::track_obj() tracks trackable objects, referenced from a functor
Functors | Functors are copyable types that define operator()()
Slots | Slots are type-safe representations of callback methods and functions
mem_fun() | Mem_fun() is used to convert a pointer to a method to a functor
ptr_fun() | Ptr_fun() is used to convert a pointer to a function to a functor
Signals | Use sigc::signal::connect() with sigc::mem_fun() and sigc::ptr_fun() to connect a method or function with a signal