Use USB webcams with iChat.
Version: 2.2.5iChat AV only recognized Firewire cameras.
License: Free To Try $9.95
Operating System: Mac OS X
iUSBCam is a tool that you can use with any QuickTime compatible video source for video conferencing in iChat AV. This includes USB webcams!
Also, iUSBCam enables video conferencing on G3 computers which fall below Apple's minimum CPU speed requirements.
iUSBCam also lets you adjust your camera's brightness, contrast, and more.
Use iUSBCam to enable your G3 for DV cameras such as the iSight.
Complete Video Settings Panel
iUSBCam adds a "Show Video Settings" menu item to the "Video" menu. You can use the video settings panel to adjust camera settings such as brightness, contrast, sharpness, and saturation. When using an iSight, many other settings will be available. Also, with some USB drivers, the "More Settings..." button will allow you to adjust camera-specific features such as face tracking.
Broadcast Your Screen
iUSBCam will allow you to use your screen as a video source. Choose "Change Video Source" and select "Screen View". The Screen View option is available even when no camera is connected.