Transferslot - Easily buy and sell side-projects
Flippa - Flippa is a platform for trading websites.
SideProjectors - Marketplace to buy and sell side projects
buysellwebsite - Created by two California attorneys, WebsiteBroker.
SaaSPlace - Acquire, invest & sell SaaS products, plugins and apps
AcquireBase - A marketplace for buying and selling side projects & SaaS apps for free. Absolutely 0% commission on successful sales. No paywall for unlocking offers.