CodeFactor.io
Codacy
CodeClimate
SonarQube
SensioLabs Insight
Source-Navigator NG
ESLint
Source Insight
Backwords
Drops
Mondly
Duolingo
CaptionPop
Flowlingo
Lingvo TV
Lingvist
CodeFactor.io
BackwordsCodacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
Drops - Visual language learning.
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.
Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.
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.
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.