Flippa - Flippa is a platform for trading websites.
Mashword - Find a name and register a domain for your business, baby, project, and more. Mashword is a powerful company and human name generator that determines the pronunciations of entered words and then creates unique combinations and variations.
Transferslot - Easily buy and sell side-projects
Panabee - Best way to search domain names, esp for apps and startups
AcquireBase - A marketplace for buying and selling side projects & SaaS apps for free. Absolutely 0% commission on successful sales. No paywall for unlocking offers.
Mono Name - Curated CSV list of available domains for your next project