CompTackle
CompTackle is an independent reseller market research tool. Search an item to see the live eBay listings and their asking prices, then add your own sold research to get a Sell-Through Rate, an estimated time to sell and a Good, Maybe or Bad rating.
CompTackle is built and run by Mathew Valdez, a reseller and Computer Science student in Miami, Florida. It is not affiliated with eBay.