The best piece of software for simple cropping of images seems (to me) to be Shotwell Photo Viewer, especially as I find GIMP's cropping methods (AutoCropping & Zealous Cropping) incomprehensible. I can start Shotwell Photo Viewer by right clicking the image file (in Nautilus).
www.yorba.org launchpad.net features: 1.import Import photos from folders or from any digital camera supported by gphoto. 2.organize Shotwell automatically groups photos taken at the same time. You can also use tags to organize your photo collection 3.edit You can rotate, crop, reduce red-eye, and adjust the exposure, saturation, tint, and temperature of each photo. 4.publish [...]
Shotwell is an image organizer designed to provide personal photo management for the GNOME desktop environment. In 2010 it replaced F-Spot as the standard image tool for several GNOME-based Linux distributions, including Fedora in version 13 and Ubuntu in its 10.10 Maverick Meerkat release. Shotwell can import photos and videos from a digital camera directly.
I installed Ubuntu Minimal and installed XFCE4 as my choice of DE. After that, I installed Shotwell Photo Manager, but I can't set the Photo Viewer as my default for images. I can right click and "open with" Shotwell Photo Viewer, but when I go into properties and attempt to set Shotwell as the default, I get the Manager instead of the viewer. Any ideas?