Accubattery - Monitor's battery capacity through the use of science
Rocketgraph - Rocketgraph is an open-source drop in replacement to Firebase, except it's much better.
BatteryCare - BatteryCare - Application and good practice guide for maintaining and optimizing the battery of the modern laptop
Plug - Lightweight OSX player for Hype Machine
coconutBattery - With coconutBattery you are always aware of your current battery health. It shows you live information about the battery in your Mac and iOS devices (iPhone, iPad)
Muru Music - Personalised playlists within seconds.