Perception is an addon focused on boss encounter analytics. It aims to provide the user with a browse-able timeline of important events and data as the fight happens. Events and data are displayed on a real-time updating graph, with tracking of all (or select) party/raid members. Perception also includes a tracking framework, so that it can be extended by plugging in additional modules.
Simple messaging system called during ready checks. Allows players to enter customized message to send. For example if you record with fraps and want a reminder to start recording when the fight is about to start.