What are some alternatives?
When comparing Lean Domain Search and Ajax Domain Finder, you can also consider the following products
Instant Domain Search - Search domain names instantly by showing results as you type.
Machiname - Machiname is domain name search tool that lets you enter keywords and it will look up domains availability for every combination
NameQL - Fast and friendly way to find a usable name for your idea, app or business
DomainHole - DomainHole has the tools to allow you to find a great domain name.
Domainr - Domainr
namegrep - Domain name search with regular expressions and curated sets