OS: Android
Price: Free
Developer: EaseUS
Type: Utility
Monetization: In-App purchases/ads

2 good things about this app:

  1. The idea/product - everybody hates it when their phone gets hot.
  2. Landing page - http://www.easeusapp.com/ - Just awesome.

The app itself is nice. Nothing really special in the UX or UI. But nice and easy.