CCFinder is short for Creative Commons Finder and it finds pictures published under the Creative Commons License. This means that you can easily search for pictures that you can re-publicize or share without breaking law or having to pay money. CCFinder also explains what you may do with each picture and what to keep in mind when doing so.
Features:
Search pictures by Keywords
Find pictures with suitable licenses, that you may re-use (also commercially or on your website)
Use color filters on pictures or use them as desktop wallpaper
Very simple to use, Windows 8 style, for XP, Vista and 7
100% Free of Charge