Logitech QuickCam VC - Source code and forum for USB driver. - http://digilander.libero.it/demarchidaniele/qcamvc/quickcam-vc.html
Using a Konica KD-200Z Digicam with Linux - Kernel patch for using a Konica KD-200Z digicam with Linux, also makes the Minolta DiMAGE E203 work - http://www.willamowius.de/konica_kd200z.html
Project details for gDC3-Play - Digital camera software for cameras using the DC-3 protocol, such as the Ricoh RDC-300, 300Z, and 4300. - http://gdc3play.sourceforge.net/
Digicam - Digicam is a simple and easy-to-use command-line utility to take, retrieve, and delete pictures from a Kodak DC21x camera. - http://www.ne.jp/asahi/linux/timecop/
dc1000 - Software for UNIX and BeOS to control the Panasonic dc1000 series of digital cameras. - http://www.df.lth.se/~roubert/dc1000/
gPhoto - gPhoto is a free, redistributable digital camera software application for Unix-like systems. It supports 90+ different digital camera models from various vendors. Featuring GTK+-based graphical user interface similar to the GIMP and GNOME desktop applica - http://www.gphoto.org/