Here is a list of all documented files with brief descriptions:

keepalive-backgroundactivity.h	Provides API for preventing / waking up from suspend
keepalive-cpukeepalive.h	Provides wrapper API for MCE CPU-keepalive D-Bus interface
keepalive-displaykeepalive.h	Provides wrapper API for MCE blanking-pause D-Bus interface
keepalive-heartbeat.h	Provides wrapper API for libiphb wakeups
keepalive-object.h	Provides common base for locking and reference counting
keepalive-timeout.h	Provides suspend aware timers with glib timeout compatible API
keepalive.h	Master header for including all libkeepalive features