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