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.