Which HelpDesk CRM to choose?

Question

Helpdesk

Please advise HelpDesk for the requirements:

• Unlimited number of clients (and not like in Jira to pay for each).
  
• Multilingual interface (English + Russian)
  
• Possibility of establishing a Wiki
  
• Possibility of establishing a FAQ
  
• Support levels (at least 3)
  
• Passing a ticket by tier
  
• Client's personal account with ticket history
  
• Multiple projects in one system
  
• An imbicile client should be able to make a request
  

You can pay, preferably with installation on your hosting. Redmine not to offer.

Answer 1

there are no such people on your server
, the easiest way is to tame Jira,
well, from zendesk to kayako and desk

Answer 2

GLPI?

Answer 3

Yuzayu _ www.manageengine.com/products/service-desk
Everything can!