AddAuctionsoftware
   A PHP and mySQL based auction software. [Commercial]
   http://www.addauctionsoftware.com/

AnServ - Auction Software
   Auction scripts including PHP Low Bids, Auction XL, XL Webstore, PHP Web Stores. [Commercial]
   http://anserv.com/software.php

E-zAuction
   Script of creating auction website or add auctions and classified ads to existing website. By SoftwareScripts.com. [Commercial]
   http://www.softwarescripts.com/ezauction.php

GeoAuctions
   Professional auction system. By Geodesic Solutions LLC. [Commercial]
   http://www.geodesicsolutions.com/products/auctions/auctions_comparison.htm

PHP Pro Bid
   Professional auction software with step by step installer, SSL support, accept payments from users via PayPal, 2 Checkout or World Pay. [Commercial]
   http://www.phpprobid.com

PhpAuction
   Open source program featuring email notification of bids, reserve prices, minimum bids, standard and dutch auctions, bid history, and newsletter.
   http://www.phpauction.net

Softbiz Auctions Script
   Run own auction site like ebay with this PHP script. Members run paid or free auctions. Also supports Dutch auctions, classifieds, fixed priced items. Demo available.
   http://www.softbizscripts.com/auctions-script-features.php

Top Auction
   An auction site-in-a-box written in PHP and mySQL. Full support for users, auctions, bids, and an extensive administrative area. By PHPLabs. [Commercial]
   http://www.phplabs.com/scripts/Top%20Auction/