What are some alternatives?
When comparing Domainr and Agile Domain Search, you can also consider the following products
namegrep - Domain name search with regular expressions and curated sets
Short Domain Search - Find short, available single-word domain names
Nuage - Nuage provides domain naming services.
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability
Instant Domain Search - Search domain names instantly by showing results as you type.
NameQL - Fast and friendly way to find a usable name for your idea, app or business