This software is the backbone of my fulltime eBay business. It manages everything post-listing including pulling all important data on the items when they end from eBay including end price, winner, winner's email etc.

It can then keep a track of every stage of the transaction and manage all the communications. It can send winner emails, print packing slips, and prepare monthly profit and loss reports. All of these are completely customisable by you and you can define as many form emails as you want for any possibility in your transaction.

The only reason I didn't give it four stars is that it is useless with buy it now and dutch auctions. Also, it can't pull the winning bidder's postal address from eBay so this still has to be done manually. A few extra custom fields would be nice too!