Cerberus Helpdesk 5.x (Cerb5) is a fast and flexible CRM toolkit. You can read all about it at the vendors website Cerberus Helpdesk Version 5 (Cerb5).
I am not affiliated with Cerberus Web, WebGroup Media LLC I just like the product and follow development of it pretty closely.
Although I like Cerberus a lot there are a few what I will call rough edges that many people would really like to get fix but getting those fixes into the main branch (core product) can be very difficult and many items end up with a status of Sea of a 1000 wish were they never seem to get fix. That list has gotten large enough I decided to combine them all together and release them so other can make use of my changes. If anyone else wants there patches included. Send them to me and I will likely include them as well.