Obox has been in the theme and plugin business for many years. But they’ve recently released a web app called SalesGenius that has a variety of tools built in to measure and report sales information for Envato markets. The product looks pretty slick. There’s a free version, but tools like revenue predictions are part of a $20 per month plan. I’d be interested to hear from ThemeForest and CodeCanyon authors to know if you’d use the paid version.