What are some alternatives?
When comparing Domainr and Lean Domain Search, you can also consider the following products
namegrep - Domain name search with regular expressions and curated sets
Instant Domain Search - Search domain names instantly by showing results as you type.
Agile Domain Search - Search great domain names for your website in seconds.
Nuage - Nuage provides domain naming services.
NameMesh - Get smart domain name suggestions using synonyms, suffixes, prefixes, short url, new gtlds to find the perfect domain name. Generate ideas for social user names and check availability for free!
Wordoid - Wordoid is a web application which helps to solve a common problem