Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Taiga - Project management platform for agile developers & designers
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TargetProcess - Agile Project Management Web Application
Basecamp - A simple and elegant project management system.
Craft.io - All-in-one product management software for entire product lifecycle