Kaiku (Japanese for "evolution", Finnish for "echo") is a Web-based reservation system for physical items. It allows you to check what is in the inventory and to keep track of who has borrowed which items. It was designed for use within a university to reserve and keep track of phones, tablets, and other gadgets borrowed by students.
Bookingpad is a Web-based booking system. Its aims are to provide an easy to use interface for people booking and to be flexible enough to be used for a variety of purposes. It uses an image as a backdrop where booking slots can be placed. Once placed, the slots are manipulated through drag and drop.
Pre-Book is a PC bookings and reservation system consisting of a Linux based server, and Windows and Linux client management software. Pre-book enables you to enforce equitable time usage of your desktop computers by limiting users to a set amount of time per day, and has numerous advanced features such as advance reservations, grace periods, no-show penalties, holiday hours, PAM authentication, etc. It is appropriate for libraries, schools, Internet cafes, university labs, and similar. The client software is available for Windows as well as Userful Desktop, a locked-down multiseat desktop Linux distribution for public computers.