DomainSigma was created out of heartful desire to provide free domain related information to webmasters and web users. I am a web developer and while deploying my web services online, I wasn't able to find a suitable online service which could provide an adequate domain monitoring information, so that I could analyze my competitors and my own websites. Many sites charge like hell for simple services like Reverse IP or IP to Location services.
So, this is what DomainSigma is all about. It provides the information which is most relevant, and everything for free.