Meeting Room Booking System (MRBS)
http://sourceforge.net/projects/mrbs/

MRBS is a system for multi-site booking of meeting rooms. Rooms are grouped by building/area and shown in a side-by-side view. Although the goal was initially to book rooms, MRBS can also be used to book any resource (computer, planes, whatever you want). This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.