You should have a look at Drupal, and use either of the below contributed modules and/or distributions for managing reservations, for something that is not a room (or a variation of that). These modules all have a stable release for Drupal version 7 (quotes are from their project pages):
Availability Calendars.
... allows you to add an availability calendar to entities. Example use cases are tourist accommodation, e.g. bed and breakfast, holiday homes or self catered apartments, and car or motor bike rental.
An availability calendar shows your customers at what dates your accommodation is still available and at what dates it is already booked.
Simple Reservation.
... provides a simple and easy way to reserve items which can be created by the administrator. Examples for it's usage can be hotel rooms, boats, cars, airplanes, basically anything you can think of which can be reserved by one individual.
The module provides the possibility to create reservations for other users (dependend on the permissions), and provides also restrictions in the maximum number of reservations a user can make and a maximum time a reservation can be made in advance.
There is NO support for payment, booking and what ever one could imagine beyond the pure and simple reservation, and it is also NOT intended to create more than this simple functionality.
MERCI.
... can extend any content type into a list of unique reservable items (like studios) or buckets of interchangeable items (like DV cameras). We followed the approach used by Organic Groups, Feed API, and Scheduler and added MERCI's configuration to the Edit tab of those content types.
Resource Conflict.
... allows for users to book resources for use during events. For example, a student can book a microscope for use within their lab.
Booking Systems Comparison
Refer to Comparison of Booking System modules for a comparison of various modules related to bookings / reservations.
This comparison contains some other modules (not mentioned in my answer here) that might be worth considering also, e.g. in case of requirements that are slightly different (as compared to those in the question here).
