GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Redmine - Flexible project management web application
Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.
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.