VCS (version control system) i.e. SVN/CVS/GIT etc.

I don't mind sorting one out, but ,most of the free ones out there require people to sign up and permissions given in order to commit files/changes.

I can add people to the google code account if you want?

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mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)