Shotwell is a digital photo organizer. It allows you to import photos from disk or camera, organize them in various ways, view them in full-window or fullscreen mode, and export them to share with others.
Import: Import photos from folders or from any digital camera supported by gPhoto.
Organize: Shotwell automatically groups photos taken at the same time. You can also use tags to organize your photo collection.
Edit: You can rotate, crop, reduce red-eye, and adjust the exposure, saturation, tint, and temperature of each photo.
Publish: Publish photos to Facebook, Flickr and Picasa Web Albums.