Flippa - Flippa is a platform for trading websites.
One Word Domains - Database of all available one-word domains
Transferslot - Easily buy and sell side-projects
Tool.Domains - Search free to register expired domains
AcquireBase - A marketplace for buying and selling side projects & SaaS apps for free. Absolutely 0% commission on successful sales. No paywall for unlocking offers.
Handshake.org - Decentralized certificate authority and naming