Hi,

As of now the ticketing system ServiceDesk Plus On Premise & SaaS version is completely free for any number of technicians. You can download the license in the link below.
http://www.manageengine.com/products/service-desk/free-it-help-desk-software.html?banner

We are making the MSP & customer support versions also free and will be announced by this week.Will keep you guys posted.

Thanks
Arvind Parthiban
Product Marketing Manager - ITSM ManageEngine