SupportX is a one stop support solution specially developed for Envato marketplace authors. SupportX comes with excellent purchase verification mechanism and designed to make it easier for both your buyers and seller himself to manage the tickets. Beside traditional email notification, SupportX features SMS notification, Notification feeds and Real Time popup notification to keep both buyers and sellers alert about the conversation.
Demo: http://themeforest.net/item/supportx-envato-api-enabled-support-forum/6524882