Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.

ImageOptim - Faster web pages and apps.

SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.

Node.js - Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications

CodeClimate - Code Climate provides automated code review for your apps, letting you fix quality and security issues before they hit production. We check every commit, branch and pull request for changes in quality and potential vulnerabilities.

Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...