Kerberos was developed as the authentication engine for MIT’s Project Athena in 1983. Released as Open Source in 1987, it became an IETF standard in 1993.
Massachusetts Institute of Technology

Software

The MIT Kerberos Consortium develops and maintains the MIT Kerberos software for the Apple Macintosh, Windows and Unix operating systems.

Find out what Kerberos is, who uses it and why: Documentation

Get MIT Kerberos: Downloads

Resources for developers: Developer Tools