Free is a web based search tool used to find out if a domain name or contact identifier is available for registration or not, targeted mainly towards domain resellers. Given a search string, Free responds with "occupied" if the domain name or contact identifier is already registered, "not_valid" if the search string does not comply with the .se naming convention or "free" if the name or identifier is available for registration.
Usage is: http://free.iis.(se/nu)/free?q=example.(se/nu) where "example.se" is the domain you want to check the availability of
The tool "free" is identical to the service DAS (Domain Availability Service) provided by other Registries.