UnderMRKT - UnderMRKT is a popular platform that provides instant notification about new and accurate eBay listing items.
uBuyFirst - Advanced eBay buying software finds newly listed "Buy-It-Now" items first!
GarageBuy - GarageBuy provides an easy way to search on eBay.
Gixen - Free online service that places bids (similar to eBay) in the closing seconds.
Myibidder - Myibidder (Myibay) is a Free Auction Bid Sniper service for eBay.
Auction Bidding Sniper for eBay - Play your cards close to your vest, and your eBay bids even closer by doing your own eBay Auction sniping.