Once it was called LikeWise-open, now it’s new name is powerbrokeropen.org and  allows Active Directory authentication for Linux, UNIX, and Mac systems by joining them to Active Directory domains.

It integrates very very well into a GNU/Linux system, using Pluggable Authentication Modules (PAM) and Name Service Switch (NSS) and it supports Kerberos, NTLM, and SPNEGO authentication.

Most importantly PowerBroker Open is available under a GPL/LGPL v2 license or with a commercial license.

Many, many kudos to BeyondTrust Software as they also provide a git repository:

<br />$ git clone git://source.pbis.beyondtrust.com/pbis.git

for us to clone!