Magento Marketplace -Opensource from Modulebazaar

Magento Marketplace extension-Expand your business by switching your existing Magento store as a multiple seller marketplace.

Our Marketplace extension helps to convert existing Magento store to a shopping mall with multi-vendor portal management. Special and attractive design for seller portal to manage the product catalog, orders, invoices, manifest, payments etc. Simplified Magento interface for store owners to manage sellers, seller products, orders, commissions and Payouts.

Store Owner:

Ability to view, approve, disapprove, update and delete a seller requested product.
Set Seller Commissions by fixed or percentage type.
Set commissions for each seller, products, product type, customer group, and category.
Ability to add, approve and disapprove sellers in a single click.
Generate Purchase Order and notify seller once the order is placed by customer.
Ability to handle simple products, configurable products.
Configure vendor public profile view.
Allow different vendors to register and sell their products.
Ability to add, approve and disapprove sellers in one place.
Ability to set a global tax of the commission for sellers. Approval Process.
Ability to review customer review and allow the review to be displayed in frontend
Seller:

Responsive Seller Dashboard.
Interface to manage profile, inventory, product details, view commission, payment transactions and etc.
Ability to upload shop logo and add shop URL.
Ability to view their orders, invoices, pending dispatches, manifests.
Get instant notification about orders, products, and payment from admin.
Ability to view the history of their payment.
Option to update products stock using CSV import and export option.
The sellers can upload the products along with multiple images via the CSV file upload.
Eases the seller's task of uploading large inventory via CSV upload.
Buyer:

Option to see the seller's profile.
The user can view all the details on the particular product by the seller.
Ability to check the availability of stocks of the product from the seller.
Allows customers to give review only if they have purchased product from that seller.