Some applications for your linux- (and maybe windows-) based PC or handheld/PDA which I have written.
Fotoalbum
Digital photograph/image management tool and viewer. Additional data is not
stored in a picture file itself but in an xml file.
It provides an abstraction layer between filesystem organization and album
organization, advanced search features, symbolic links, hyperlinks and much more.
tbkp
qrbackup
MuPO
A multi-purpose-organizer for your PC or your PDA (like the Agenda VR3 or iPaq)