Active Directory & Password Kiosk

Hi,

I’m looking for a solution on the above subject. Do any of you have this deployed in your organisations? Any one using a free ware solution?

Password Kiosk is a self-service web-based facility linked with Active Directory that enables users to reset forgotten password and unlock their accounts, without support from the Systems Administrator.
Additional Info:
– limited budget of around 15k
– AD users of at least 1000
– I’m particularly interested in an Open Source solution, but, let that not limit your suggestion.
Any suggestion is greatly appreciated!