BayMail 

BayMail allows you to send email to other eBay users without their actual email addresses. Send messages to up to 5 users at once without leaving the auction page you're viewing. BayMail works like an email client but sends email through eBay.
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Password Master - Never Forget Another Password 

Never Forget Another Password! Your secure source for storing all User IDs, Passwords, associated URLs and any additional information you would like to document. Easily copy and paste between Password Master and any Windows based browser.
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BidderBlock 

Create, maintain, and share a list of bidders who are blocked from participating in your eBay online auctions. Save and share your list with other users. View information about bidders on your list and send them messages through eBay.
ebay bidder seller online auction auction management

webPeddle 

webPeddle is an amazing little storefront kit with some very big capabilities. Like a buy button on steroids, it's a storefront that's quick to set up, easy to maintain, and lets you create your own product list using a built-in database structur
e-commerce storefront shopping cart