SoapUI is a free and open source cross-platform functional testing
Now continued as OculiX — see oculix.org
A modern load testing tool, using Go and JavaScript
Speedtest Tracker is a self-hosted internet performance tracking app
Fast, easy and reliable testing for anything that runs in a browser
Create browser tests 10x faster
Learn Go with test-driven development
This Ansible collection provides battle tested hardening
Security- and exploitation-oriented utilities and proof-of-concepts
The most advanced tool for HTTP API
The Open Source Test Automation Platform
CLI tool to build, test, debug, and deploy Serverless applications
Record your test suite's HTTP interactions and replay them
HTTP checks & tests (private & public) monitoring
Lightweight service virtualization/ API simulation / API mocking tool
Headless Chromium-based web performance metrics collector
Drill is an HTTP load testing application written in Rust
Most popular Mocking framework for unit tests written in Java
Test Runner for JavaScript
Database Subsetter and Relational Data Browser
Testing and automation scriptable tool
A C++ library for AVR and NodeMCU
Test HTTP webhooks with this handy tool that displays requests
Unit testing for SAS(TM)-programs
A programmer-oriented testing framework for Java