What are some alternatives?
When comparing Ajax Domain Finder and Flagfox, you can also consider the following products
Machiname - Machiname is domain name search tool that lets you enter keywords and it will look up domains availability for every combination
DNSdumpster.com - Open source domain intelligence lookups for security recon
DomainHole - DomainHole has the tools to allow you to find a great domain name.
IP2Location - IP2Location is a leading provider of IP intelligence service.
namegrep - Domain name search with regular expressions and curated sets
DomainTools - Domain name research, including comprehensive Whois Lookup, Reverse Whois Lookup and Whois History.