Clect - A social marketplace for collectors
Silent Auction Pro - Simple * Affordable * Powerful --- Silent Auction Pro is a multi-user, internet-based fundraising software system providing complete donor and auction management solution for charitable organizations.
Lofty - Trusted Marketplace for Fine Arts, Antiques and Collectibles
SchoolAuction.net - SchoolAuction.net is a web-based software to help school auction teams plan, manage and run school fundraising auctions.
Thinga.Me by Microsoft - Make virtual collections of your real stuff
BiddingOwl.com - BiddingOwl.com provides non-profits with auction management tools and helps to acheive fundraising goals.