GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
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.
Redmine - Flexible project management web application
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.
Lean Testing - Lean Testing is a free bug tracker and test case management software for high performance development teams
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.