Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

Gatling is a powerful open-source load testing solution that integrates with your development pipeline. It includes a web recorder and colorful reports.

Application Lifecycle Management (ALM)

Squash is a suite of tools to design, automate, run and industrialize your tests.

SeleniumBase Case Plans is Test Case Management Software that uses Markdown tables for displaying test plans directly in GitHub (and other source code management systems that support Markdown format).

TestCase Studio is a free browser plugin to record the user actions performed on web in plain English Sentences. Recorded steps can be saved as a Test case & very helpful to reproduce the bugs. It also generate XPath, cssSelector & Automation Code.