digiKam is an advanced digital photo management application that makes importing and organizing digital photos a trivial task. Photos can be organized in albums, which can be sorted chronologically, by directory layout, or by custom collections, and they can be tagged, commented, and rated. digiKam makes use of a fast and robust database to store meta-information, which makes adding and editing comments and tags very reliable. Metadata can also be stored inside pictures using Exif and IPTC. An embedded image editor and a standalone application named showfoto have simple but powerful features for editing your pictures with filters and correction tools.
A lot more than a photo management application
This tool is really great. It does a lot more than just managing your pictures. There is an embedded editor (also available as a standalone application called showfoto) that allows a lot of modifications and fixes (filters, red-eye, reduce noise, aspect-ratio crop, and a lot more).
It's a must have !