Transferslot - Easily buy and sell side-projects
SideProjectors - Marketplace to buy and sell side projects
Flippa - Flippa is a platform for trading websites.
buysellwebsite - Created by two California attorneys, WebsiteBroker.
1Kprojects - Neglected side projects for less than $1000.
BuySellEmpire - To help owners/vendors buy and sell high-quality domains/websites for a better price.