What are some alternatives?
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Greenify - Greenify is a mobile app that gives you greater control over your Android device's power usage, allowing you to get a lot more mileage out of your battery life without having to constantly plug it back into a charger.
AppleJack - AppleJack is a user friendly troubleshooting assistant for Mac OS X.
JuiceDefender - Über 5.
Glary Utilities - The Official Website of Glary Utilities.
Battery Doctor - Battery saving app with charge monitor and widget.