WeBid provides open source auction software which has been used around the world and has been downloaded over 100,000 times.
It will allow you to quickly set up your own auction site and get started straight away. See a full list of features here
WeBid is a popular open source web-based auction software. Built on PHP and supports Linux, Windows and Mac OS X on the server side. Compatible with Chrome, Firefox, Safari, Opera and IE 7+. Released under the terms of the GNU General Public License (GPL).