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
Open Web Planning
Multi-project management, web-based Project Management suite.
A Comprehensive Alternative to Office 365 for Business
Rapid Business Information Organizer
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
MPP Viewer is a viewer for Microsoft Project files
iTeam - Online Project and Client Management System
task management, bug tracking, kanban, project management