Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.
Redmine - Flexible project management web application
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.