GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Redmine - Flexible project management web application
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Bugfender - Cloud logging for your apps, not only crashes matter
Prometheus - An open-source systems monitoring and alerting toolkit.