An open source issue management & help desk solution
Free self-hosted help desk & shared mailbox
Open source help desk ticketing system
The Free & Popular HESK Web Based Software in Complete Virtual Machine
Easy to use ticket system for internal workflow
Jnestor is another majordomo in java
Cory Support is a PHP application submit support tickets and staff
Ticket System .NET Open Source (ITS, Issue tracking system)
System of registration and processing of requests for IT-service.