List of free quality-assurance stuff for developerππ½
If you're looking for all programming tools around quality-assurance (not just free). Check this page List of quality-assurance Programming Tools

Selenium
Selenium is a portable framework for testing web applications. Selenium provides a playback tool for authoring functional tests without the need to learn a test scripting language
Tag: testing, quality-assurance, browser-automation, browser-test
create robust browser-based regression automation suites and tests scale and distribute scripts across many environments

Code Climate Quality
Quality by Code Climate provides automated code review for test coverage, maintainability and more so that you can save time and merge with confidence.
Tag: code-review, quality-assurance
Free forever for open source Unlimited public repositories Unlimited users GitHub pull request integration
For <4 seats Unlimited private repositories Everything in the team plan up to 4 seats

Bird Eats Bug
Bug reports that developers love - with screen recording and technical logs captured automatically.
Tag: testing, quality-assurance, debugging
Screen recording / Screenshots Automatic technical log capture Storage for 50 bug reports