CalLUG was the GNU/Linux user group at UC Berkeley, from 1997 to 2003 (http://callug.cs.berkeley.edu/), and then again from 2005 to 2007 (http://www.ocf.berkeley.edu/~linux/), as recorded by the Wayback Machine.
Although no single CalLUG entity exists today (this may change in the future), there are still a number of related groups around campus.
The OCF provides free printing, web hosting, disk space, email, and Unix shell accounts.
The CSUA hosts hackathons, workshops, parties, and startup fairs.
CalSEC discusses computers and security at weekly meetings.
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