Demo, extensive installation instructions, and free limited-trial download. Requires Mac-based server, and only supports read access of calendars. Amplitude Software's Reserve WorkGroup . Demo and a limited-trial version. Reserve uses HTML forms for all of its setup and very difficult too.
Documentation is in Acrobat.
Russell Information Calendar Manager has its CM Web component that allows you to use browsers with its software, and insert URLs into notes. Microsystems Software's CaLANdar Web View . Demos and limited-trial version. CrossWind Technologies CyberScheduler . Demo and trial versions for NT and Unix-based servers running Synchronize software from this company.