Coverity Scan - Find and fix defects in your Java, C/C++ or C# open source project for free
Testsigma - Complete AI-driven Test Automation platform for Web apps, Mobile apps and APIs. Simple English commands to automate complex tests easily and effectively with all the flexibility that enterprise teams need!
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.
Monkey Test It - Primate powered algorithms that scan your site for common bugs and SEO mistakes.
Embold.io - Peer Code Review
BugBug.io - BugBug makes test automation ultra-simple. It allows you to automate testing without coding, ensuring the quality of your web app or website without repetitive manual testing or writing a line of code.