YouTrack - Free, online, easy-to-use, fully customizable issue tracking and agile project management tool your development team will love, by JetBrains. Our cloud or your server.
Taiga - Project management platform for agile developers & designers
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.
Plan.io - Planio makes web based project management and team collaboration more efficient and fun. It is the perfect platform for your projects, team members and clients.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
TargetProcess - Agile Project Management Web Application