digiKam

digiKam is a Digital photo management program designed to import, organize, enhance, search, and export your digital images to and from your computer. It enables you to manage large numbers of digital photographs in albums and to organize these photographs for easy retrieval using tags (keywords), captions, collections, dates, geolocation and searches. It has many features for viewing, organizing, processing, and sharing your images. Thus, digiKam is a formidable digital asset management (DAM) software including powerful image editing functions.

• Setup your collections
• Import photos, raw files, and videos
• Organize your collections
• Search in your collections
• Browse, compare, and view items in your collections
• Post-processing, editing, assembling, and transforming your photos
• Share and publish photos

Darktable

Darktable is a 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.