I'd recommend Jira:

http://www.atlassian.com/software/jira/

We use it primarily for software projects and bug tracking, but it can easily be configured as a helpdesk application, and still be used for other things.  Very configurable, easy to setup and maintain and they have reduced pricing for non-profits and government institutions.  I'm not sure about HR applications, though.

____________________________________________
Adam Wead
Systems and Digital Collections Librarian
Rock and Roll Hall of Fame and Museum


On Tue, Jul 19, 2011 at 10:22 AM, Robert Heller <heller@deepsoft.com> wrote:
At Tue, 19 Jul 2011 12:32:50 +0100 CentOS mailing list <centos@centos.org> wrote:

>
> Hi all, sorry for being OT but would any of you recommend a ticketing system?
> We'd like something pretty comprehensive to cover helpdesk and HR stuff as
> well as software bugs/requests. There seems to be a million variations
> out there.