If you're looking for a Marketplace website, there are several different platforms to build this on. Magento being our preferred ecommerce platform offers several plugins to achieve this. The benefits are obvious - As it is built on an ecommerce platform, managing your suppliers and customers is a breeze, while a good marketplace plugin provides the marketplace features needed to build a successful marketplace website.
Here are some Magento plugins that we have short listed for this purpose.
Neteven - Plugin with full installation service
uMarketplace - Off the shelf plugin
WebKul - Good marketplace plugin
One thing to note is that aside from the marketplace features available, the support provided by these plugin providers is something to consider.
Installation can be somewhat frustrating if you run into technical issues, therefore good support is essential while choosing such a plugin.