osTicket

osTicket is a globally recognized, open-source support ticket system designed to streamline customer inquiries and improve support efficiency. Architected primarily in PHP with a MySQL/MariaDB backend, it serves as a robust alternative to high-cost SaaS solutions like Zendesk or Freshdesk. By 2026, osTicket continues to dominate the self-hosted market due to its 'SupportSystem' cloud offering and its extensible core that allows for deep customization of ticket workflows. The platform's technical architecture excels in environment-specific deployments where data sovereignty and local compliance (GDPR/HIPAA) are paramount. It utilizes a sophisticated Ticket Filter engine that allows for automated routing, and a Custom Forms module that enables precise data collection. With the rollout of its modern v2.0 framework, it offers a responsive interface and enhanced API capabilities, bridging the gap between legacy stability and contemporary UX requirements. It remains a staple for IT departments, educational institutions, and government agencies requiring a transparent, audit-ready communication trail without per-seat licensing constraints.