1)   FeeFinder 3.7
FeeFinder takes the mystery out of eBay's complicated fees. It can calculate your fees for virtually any type of eBay auction, as well as PayPal and eBay Payments costs. It works with eBay UK, eBay Canada, eBay Germany and the main eBay site.

 2)   PPCalc - PayPal Fee Calculator 2.2
PPCalc allows you to quickly and easily calculate your PayPal fees before you accept money online. It also allows you to "reverse" calculate your PayPal fees to determine the exact amount a person must send you for you to get the amount you want.