digiKam is a KDE photo collection manager. It provides streamlined importing and organizing/classifying them into albums or chronologies. Besides allowing custom directory schemes for storage, it also permits plain tagging, indexing and rating. Through KIPI it integrates with other KDE photo management software; but also provides a Light Table tool to pick highest quality shots from a series, or retouch them. A built-in image editor can apply colorization and lightning correction effects.
PhoyoID is a free (open source) graphical user interface that helps to print photographs that conform to the biometric passport standards. No need to use a public photo booth anymore if you have this software, a printer and the appropriate paper.
FreezeFrame is a free multi-platform personal photo and video library manager. It manages keywords, title, comment, rating, GPS location, address and shows media locations on a map. Media can be viewed as a slideshow and exported by email or file. Note: videos must either use the MP4 container format with H.264/AVC video and AAC audio compression or the FLV container format with VP6 video and MP3 audio compression.
Shotwell is a photo manager for the GNOME desktop.
Picha is a simple tool to download images from photo blogs. It currently supports extraction from Tumblr.