Hamachi for Linux is provided by LogMeIn since 2010. For years though, a legacy version (0.9.9.9-20) from Applied Networking (a company aquired by LogMeIn in 2006) remained widely used. Until July 30th, 2012 when the legacy version was finally axed by LogMeIn.

LogMeIn Hamachi for Linux (Beta)

https://secure.logmein.com/labs/