Help Desk are web application written in different server side language like PHP, ASP, JSP, CFM etc and are back end by various database engine like MySQL, Oracle, Microsoft SQL server, PostgreSQL, Firebird etc. There are a number of ready made Help desk script available in the Internet. Most of them are not free to download, paid.
So what is hosted help desk? Hosted means you don’t have to worry about your own server/hosting space, installation, and maintenance. You just need to register and get started. Free means you don’t have to pay anything to use. There are lots of popular commercially available help desk on the net. I can say Kayako, Zendesk, Perldesk etc. Some of them offer both hosted and download-able options. There are also some popular free download-able help desk out there.
MojoHelpDesk by Metadot coded with ruby language is hosted, easy to configure easy to use and have a free plan option. It’s interface is very simple and user friendly. Configuration is also not time consuming. In their free plan you have some limitations in resources and functionality. After registration you will get your chosen subdomain of their main app domain. However, you can point to your own domain (like support.mydomain.com) if you upgrade to their paid option. Another thing is their free option is not ad based. Only credit info of them are shown in the footer of application and all outgoing emails.
If you are using Google Apps for your business, you can also integrate Mojo Help Desk very easily.
Register and get your desk. Support your client/members easily. Their URL is http://www.mojohelpdesk.com/