GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
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.
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Redmine - Flexible project management web application
Zabbix - Track, record, alert and visualize performance and availability of IT resources