Shotwell is an open source photo organizer designed for the GNOME desktop environment.
Import photos from folders or from any digital camera supported by gPhoto.
Shotwell automatically groups photos taken at the same time. You can also use tags and ratings to organize your photo collection.
You can rotate, crop, reduce red-eye, and adjust the exposure, saturation, tint, and temperature of each photo.
Publish photos and videos to Facebook, Flickr, Picasa Web Albums, and YouTube.