what OS do you use?
if Windows, there is always Paint
(in vista the picture viewer can do simple tasks such as crop or resize, click on the pic, on the middle-up part of the monitor thereis an option "Fix"
if you have Office, there is Microsoft Office Picture Manager (In vista again click on the pic, on the middle-up part of the monitor thereis an option "Open" theres in option to pen with Office pic manager)
if you want a free, lite and easy download irfanview:
http://www.irfanview.com/