Most videophone packages come with conferencing software.
Other popular choices are NetMeeting 2.1, which Microsoft offers to Windows users for free, and iVisit, a cross-platform shareware product from iVisit. Setup is easiest with the iVisit software because it's the most basic package. While slightly more complicated, CU-SeeMe lets you configure camera settings such as brightness, contrast, and color level. Videoconferencing works best when the person receiving your video feed is using the same software as you are. If the codecs don't match, you'll probably hear but not see each other.