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.
MSI Afterburner - Tool to manage video cards. Shows video card stats (temp, GPU usage, etc.).
Accubattery - Monitor's battery capacity through the use of science
ASUS GPU Tweak - ASUS GPU Tweak fully implements TechPowerUp’s GPU-Z analysis and monitoring features.
Power Battery - Power Battery, as the most professional battery saver app, could get up about 60% more battery life for Android phones or tablets.
Guru3D - Guru of 3D: PC Hardware Reviews and tests