Transporter App: Screenshot upload manager for iTunes Connect!

Transporter App is an easy and simple tool that lets you upload hundreds of different and localized screenshots, metadata and app previews to iTunes Connect using an easy drag and drop mechanism. Transporter will figure out the device sizes, ordering, and localizations based on file name. Transporter also auto-saves all your image assets on their server and retry uploads in case it loses connection with iTunes Connect. Once the screenshot upload is completed, it will send a notification about the latest status.

Source: Transporter App