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

WebLOAD – Performance and Load Testing for the Most Challenging Web Applications

HyperTest is a no-code test automation tool that regresses all your APIs by auto-generating integration tests using your network traffic, also giving a way to reproduce these failures inside actual user-journeys.

Voiden is a developer-first API client with local storage, Git-integrated, all based on markdown + offline support.

Anyone on your team can load test with instant playback, an easy-to-use interface, and real browsers for reliable data.

Locust is an open source performance/load testing tool for HTTP and other protocols. Its developer-friendly approach lets you define your tests in regular Python code. Locust tests can be run from command line or using its web-based UI