Jenkins

A free and open-source automation server to achieve Continous Integration (CI) process.
CircleCI

A continuous integration and continuous delivery platform for automating development workflows
Travis CI

A hosted continuous integration service used to build and test software projects.
Prometheus

An open-source monitoring system with a flexible language & database.
GitHub Issues

Use issues to track ideas, enhancements, tasks, or bugs for work on GitHub.
Raygun

A fully integrated error, crash and performance monitoring solution
StatusPage.io

Allows you to post in detail about specific downtime incidents.
Splunk

Collects and indexes data from just about any source imaginable.
GitLab

A tool that provides a Git repository manager providing wiki, issue-tracking and continuous integration and deployment pipeline features
Jira

A project management tool that enables collaboration between teams within an organization.