Picasa

             Compatible with iPhoto, Picasa makes organizing, editing and sharing your digital photo albums. This manager scans your Mac and list all images on your hard drive, including those in your iPhoto library. The principle then is the same with all operating systems: improving the management of photos, and facilitate the sharing and posting of digital albums.
A "Sync to Web" feature to automatically synchronize albums on the hard disk with their online version. No need to manually re-download images from an album after their modification.
              Direct editing of the images is greatly facilitated by new tools and adding logos, text and watermarks on your creations.
Finally, a feature to create videos, from a montage of photos, videos and music on the hard drive. Once editing is complete, you can upload it directly to YouTube.