An interesting feature in digiKam is that it lets you preview all your photos directly from your digital camera, without having to move them to your computer or download/delete them. It can also import pictures from Facebook and Picasa, so you don't lose any of your albums.
Thanks to its comprehensive graphic editor, you can do a good number of things to your image, applying different filters and textures as well as using other tools to improve your photos.
All this makes digiKam a good choice amongst all the other photo-editing applications out there. It not only organizes your pictures and lets you view them, but also incorporates an efficient editor so you can create error-free images to share and be proud of.