Looking for a good "domain engine"

[DomainEmpire.com]

I'm looking for a way to get all registered variations of a domain containing a specific keyword under the main TLDs (com net org biz info us ...), no matter if it's a web based engine or a software.

Until few weeks ago, I used domainsurfer.com (now offline, no longer in service for unknown reasons) so recently I began to use that function at whois.net (which's no longer working) ... I'm looking for a good alternative ... Any idea ?