Namelix - AI business name generator
Panabee - Best way to search domain names, esp for apps and startups
Name Ideas Generator - A simplistic domain 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.
NameQL - Fast and friendly way to find a usable name for your idea, app or business
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability