Expert Auction Services  
   Lists items on eBay for businesses specializing in big-ticket items. Also offers training, store creation, digital photography, and web site design.
   http://www.expertauctionservices.com/

AuctionLink  
   Creates short web addresses for eBay sellers that automatically link to users' current auctions. Free and paid options.
   http://www.auctionlink.to/

HammerTap  
   Offers a variety of software tools and web services to assist online auction users.
   http://www.hammertap.com/

Auction Contact  
   Service allows sellers to send weekly updates to customers with direct links to auctions.
   http://www.auctioncontact.net/

InkFrog  
   Image hosting, templates, feedback, emails and other support for eBay sellers.
   http://ww3.inkfrog.com/

AuctionWatch.com  
   Image hosting, store manager, customer manager and other seller services.
   http://www.vendio.com/

The Seller Sourcebook  
   Auction templates, listing generator, image hosting, product sourcing guide and informational articles.
   http://www.sellersourcebook.com/

Bay to Go  
   Provides SMS alerts to eBay seller's cell phone when a new bid is placed.
   http://www.baytogo.com/

Auction Hawk  
   Services for general auctions on eBay. Images hosting, ad creation, scheduling and post-sales.
   http://www.auctionhawk.com/

I-Bid  
   Search, watch and bid on eBay from a cell phone. Integrates with desktop browsers to minimize phone typing.
   http://i-bid.com/

AuctionSieve  
   Filters through the auctions in eBay categories and allows searches, with the ability to combine search results. Freeware. Multiple platform versions, including Windows, Macintosh, Java, Linux.
   http://www.auctionsieve.com/

Auction Supplies  
   Shipping calculators, auction templates, practice boards, color charts and other tools for sellers.
   http://www.auctionsupplies.com/

AuctionSage HomePage  
   Management and posting services for eBay sellers. Works with Bidville also. [Windows 95/98/ME/NT/XP/2000]
   http://www.auctionsagesoftware.com/

Auctiva  
   Provides a set of different services, including posting, showcase/image hosting, counters and feedback handling.
   http://www.auctiva.com/

MaxBidPrice  
   An auction optimization service that using mathematical techniques to find the best auction parameters, in order to save time and earn more money for sellers. [Beta testing]
   http://www.maxbidprice.com/

Trak Auctions  
   Free eBay web based auction management, including counters, emails and feedback. Also offers image hosting.
   http://www.trakauction.com/

SmartCollector  
   Provides research tools based on eBay sales data to determine item values and market trends for collectibles and antiques. Also offers a collection management tool and educational resources.
   http://www.smartcollector.com/

Ebaytools - Sourceforge  
   Free (Open Source) tools for watching, bidding, selling and searching on eBay auctions. All data and pictures stored in local SQL database for offline searching and viewing.
   http://ebaytools.sourceforge.net