If you want to spend a nice time editing photographs and you don't have the time and money to install expensive editing applications, Paint.NET is the tool you want. Free, awesome and ready for you to try it!
It will give the most amazing effects to your photographs; you can cut them, rotate them or resize them. In addition to that, it comes with features to change the tones of your images, improve their resolution and make collages.
This program, even when is totally free, supports layers! A cool editing option used by professional designers and photographers. It has an accessible interface and menus with a wide range of possibilities you can use to work with.