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We need a website similar to www.tradus.com in functionality with integration with POS and ERP solution like openERP for each seller..
The website must be more or less same as tradus.com
Please see the complete functionality of tradus.com and see the video http://www.youtube.com/watch?v=wxsxhj3mwyc explaining how the seller work... also we would need a connector for connecting OpenERP of each seller to manage his inventory on our website synchronously in realtime so that the actual inventory details are shown on our website.
Tradus has provided a web interface for seller...apart form that interface what we need is a connector using which they can connect their on premise openerp solution with our website so we can get their realtime inventory details and price and they can get the product description etc from our website into their openerp so that all they have to manage at their end is inventory sku and price
You will need to make a (magento/opencart/spreecommerce) extension for multiseller part and a connector to openerp.
There are many connectors available for openerp and magento/opencart/spreecommerce integration that are free and opensource.