This extension for RT adds a new "Forgot your password?" link to the front
of your RT instance. Any user can request that RT send them a password
reset token by email. RT will send the user a one-time URL which he or she
can use to reset her password.

It also adds a new option to the user admin page in RT for the RT admin to
send a password reset email for new users or users who have forgotten their
passwords. See below for options to enable this admin feature only and
disable self-service features.