Auction Mage is a sniper software to manage and bid on your online auctions. It has many features: multi-language, bid now, bidding groups, timesync, $ and euro support, RAS connect, browser control (server mode), ...
DealerSys is a flexible retail e-commerce system for businesses which do not
fit mainstream e-commerce systems. It handles items sold by length, area or volume, unique items, and auction items.
auctionANT is an auction management tool.
It uses endofauction mails to generate a customer db and
send automatic payment instructions.
It also manages incoming money, ...
It is written in Java so it is platform independent.
Windows, Linux, Solaris
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Auctioner is an eBay-stylish auction software. It is intended as an example for the book "Portale und Webapplikationen mit Apache Frameworks" ed. Fabian Theis, but it may serve as a starting point for further development as well.
Gavel is a Web application for hosting charity auctions online. It was orginally developed for use by a public broadcasting station and is being refactored for general use.