[PLUG] [OT] Help Desk software in Open source

[Nikhil Kala]

Hello All,

Does any one know any open source software which is used for help desk
purpose.

I am looking for feature like,
1) Ticket raising feature by user
2) acknowledgment to user after his problem or query has been replied by
email.
3) Knowledge management system for reference to user.




Thanks & Regards,
Nikhil Kala
http://www.nikhilkala.com