AirBrake - Airbrake is the leading exception reporting service, currently providing error tracking.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
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.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
HoneyBadger - Exception, uptime, and performance monitoring for Ruby.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.