After eBay announced that they will deprecate Blackthorne, I started searching for an alternate desktop app to use. Fellow eBayers suggested using Wonder Lister. During the past few months, have tried out several apps out there but finally settled for Wonder Lister. It is a great desktop app, full of nice features, very fast, extremely good customer support and best of all is very reasonably priced.
Would highly recommend it to any eBay seller.