myQuiz.org - myQuiz is an Audience Engagement Cloud Platform
Coverity Scan - Find and fix defects in your Java, C/C++ or C# open source project for free
TestMOZ - TestMOZ is an online platform for creating interactive quizzes and questions to keep your audience engaged on your social media, websites, or blog channels.
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.
QuizWhizzer - QuizWhizzer is a platform that allows you to create a quiz to engage your audience inactivity.
ReSharper - ReSharper is a productivity tool for visual studio that provides tools and features to help you manage your code.