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ZenTao is an open source Scrum tool for application development projects with features including Backlog Management✓ Sprint and task✓ bug tracking✓ Scrum✓ Waterfall✓ Roadmap✓ Burndown✓ Kanban✓ SaaS✓ Self Hosting✓
php todolist is a more advanced approach for simple todo lists. It is an ajax/sql-based multi user todolist, with priority, status and categories. You can use it as a bug track / feature request and task manager system within a group of developers.