There are multiple platforms that can be used to sell websites and domains, which include:
Flippa: A popular marketplace for buying and selling websites, with a wide variety of sites available for purchase.
Empire Flippers: This is another marketplace for buying and selling websites, with a focus on more established, profitable sites.
Website Broker: This platform specializes in the buying and selling of websites and online businesses.
BizBuySell: A marketplace for buying and selling small businesses, including websites. They do not charge any listing or selling fees.
WebsitesForSale: A platform that specializes in buying and selling websites. They do not charge any listing or selling fees.
FE International: This is a leading M&A firm for e-commerce businesses, which specializes in the buying and selling of profitable websites and apps.
Ultimately, the best platform for selling your website will depend on your specific needs and the type of website you are selling. It's good to do research and compare the fees, process, and audience of different platforms before making a decision.