Optar is a software codec that generates 2D bar codes for data storage on paper using a black and white laser printer and scanner. It fits 200kB on an A4 page, uses Golay forward error correction codes to ensure reliability, and can also be used to store data on photographic film.
OrbySPV (Sequential Panoramic Viewer) gives you the ability to create highly interactive virtual tours, similiar to the Google Maps Street View, using your own panaromic images. The Orby experience is not like the other virtual tours that you may have seen around the Web, where you stand in one spot and look around in a static 360 degree bubble. Orby has that ability, but instead of standing in a single position, you can actually walk around in the captured environment, stop at any position, and zoom and rotate as much as you want.
Picasa is Google's photo organizer. It makes it easy to find, edit, and share digital photos. It automatically locates and remembers all pictures and sorts them into visual albums organized by date with recognizable folder names. You can drag and drop to arrange albums and make labels to create new groups. This Linux version mostly has the same features as the Windows version, and is based on a modified version of Wine.