Here is a list of all files with brief descriptions:

[detail level 12]

▼ avahi-client
client.h	Definitions and functions for the client API over D-Bus
lookup.h	Lookup Client API
publish.h	Publishing Client API
▼ avahi-common
address.h	Definitions and functions to manipulate IP addresses
alternative.h	Functions to find alternative names for hosts and services in the case of name collision
defs.h	Some common definitions
domain.h	Domain name handling functions
error.h	Error codes and auxiliary functions
malloc.h	Memory allocation
simple-watch.h	Simple poll() based main loop implementation
strlst.h	Implementation of a data type to store lists of strings
thread-watch.h	Threaded poll() based main loop implementation
watch.h	Simplistic main loop abstraction
▼ avahi-glib
glib-malloc.h	GLib's memory allocator for Avahi
glib-watch.h	GLib main loop adapter
▼ avahi-gobject
ga-client.h
ga-entry-group.h
ga-enums.h
ga-error.h
ga-record-browser.h
ga-service-browser.h
ga-service-resolver.h
▼ avahi-qt
qt-watch.h	Qt main loop adapter
▼ avahi-ui
avahi-ui.h	A Gtk dialog for browsing for services