The Free & Popular HESK Web Based Software in Complete Virtual Machine
Web Online Registration and Payment System for Events
Simple-to-use/-install issue-tracking system: web, REST, email, CLI
Issue tracking and team collaboration system
COSST is a completely free open source support ticketing system.
Web Application used to manage clients, create invoices, timesheets
Keep track of all your job costs, make sure you don't lose money
Build a collaborative software development site (software forge).
Project Management and Issue Tracking for internal and customer use