Official GanttProject repository
GPL version of Javascript Gantt Chart
Zentao is an agile(scrum) project management system/tool
A web-based project management system
#1 alternative to Microsoft Project : Project Management & Gantt Chart
Free project scheduling and management tool
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Multi-project management, web-based Project Management suite.
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Simple, interactive and highly customizable Gantt chart component
Web-based Project Management System using the Kanban methodology
Open source Scrum tool and an ALM solution
Project Portfolio Management
iTeam - Online Project and Client Management System
task management, bug tracking, kanban, project management