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.

Supercharge team collaboration by sharing screen capture, logs, and debugging information from local development.

Best "simple" screen capturing app (Mac and Windows) because it creates animated gifs that attach to bugs easily. Simple because it works a lot like snippy to capture screen areas

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.

A screenshot/screenvideo tool! Also allows you to do basic alterations to the screenshots (arrows, blur, ...)