Transferslot - Easily buy and sell side-projects
One Word Domains - Database of all available one-word domains
Flippa - Flippa is a platform for trading websites.
Undeveloped - Domains you never thought were available
BuySellEmpire - To help owners/vendors buy and sell high-quality domains/websites for a better price.
Dictionary Domains - Unregistered dictionary word domains for your side project