TicTrack is a web based project management and bug tracking tool. It can also be applied to the Client support Management issues.
You can schedule your projects and designate the workflow, create the illimitable number of issues.
The great benefit for clients is an unlimited access, which means, that the system is available for the unresricted numer of simultaneous users and any number of staff members can be added.
Besides, this programm is easy in installation.
The price of TicTrack starts at $25 per month, but there are also free trials.