Frontend Submissions for Easy Digital Downloads lets you create a marketplace by allowing vendors to submit their own products for inclusion in your online store. This can be used to create a a digital goods marketplace similar to ThemeForest or CodeCanyon. It has a complete suite of features useful to both vendor and marketplace manager.
You have full control over the fields available for vendor registration and product submission. Vendor applications and submissions can be approved or rejected from the WordPress admin area. The vendor receives a customizable email depending on the action taken. From their account, vendors can manage their products and see statistics about sales.
The EDD Commissions plugin can be used in conjunction with this marketplace plugin in order to make paying vendors their share easy.
Pro Plugin Directory uses EDD Frontend Submissions as an easy way for plugin sellers to submit and manage their listings.