AstroCam is an C based daemon process for Linux and BSD to control stepmotors via SMC 800 cards. AstroCam also includes both, an PHP-based WebInterface and one based on Perl, for remote Stepengine control. You can control webcams with it.
ZoneMinder is video and cctv surveillance and security application. It supports multiple video or IP cameras and a sophisticated motion detection system based around zones. Both live streams and historic events can be viewed via the web interface.