DomainWheel - Smart startup name generator
DAN.COM - DAN is on a mission to make unused domains accessible to all
Namelix - AI business name generator
dofo.com - Domain search platform Dofo.com gathers all registered (350 million) domains of the world in a single place. Dofo also brings together all the domain names that are on sale, provides useful features, all completely free.
Panabee - Best way to search domain names, esp for apps and startups
BrandBucket - The original marketplace for business names and creative domain names.