ProjectForge is a web-based solution for project management including time tracking, gantt-charting, financial administration, issue management, controlling and managing work-break-down-structures (e. g. together with JIRA as issue management system). Extend ProjectForge with your own plugins.
Feng Office is an online project management and collaboration software. It allows to manage tasks, events and meetings, time tracking; group communication, document editing and sharing, gantt charts, billing for customers and vendors. It's available as open source community version or SaaS.