YATTIE exists to help make tester's lives easier. Ideally, it should remove friction from the exploratory testing process - everywhere from gathering evidence to submitting reports.

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, ...)

Unifying API testing, API Performance testing, API Mocks and UI testing.

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

Bruno is a Fast and Git-Friendly Opensource API client, aimed at revolutionizing the status quo represented by Postman, Insomnia and similar tools out there.