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.
darktable is an open source photography workflow application and RAW developer. A virtual lighttable and darkroom for photographers. It manages your digital negatives in a database, lets you view them through a zoomable lighttable and enables you to develop raw images and enhance them.
Filebydate is a tool that organizes (moves and copies) files. The destination directory is based on either file or exif dates and the user specified date pattern.
easyphoto is a shellscript wrapper that tries to automatically enhance the quality of photos. Only JPEG files with the file extensions .jpg or .JPG and some RAW formats are supported.