1)   LBE Free Helpdesk 2.5
Free multi-user helpdesk system - no timeouts, no tricks!!! This is an earlier version of our helpdesk system and is completely free to use. Features: Audit Trail, E-mail notifications, Customer Details,Prioritize, Flexible Reports.
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 2)   Polar Help Desk 4.1.5.29
Polar Help Desk is a web based solution that helps you organize support department. With its features like incident management, knowledge base, email integration, reports and user friendly interface it helps you manage your support department.
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