k6 Open Source is designed for load testing. Extensible to support other types of testing.

Orderly Ape is an open source (MIT) tool to run distributed and scalable k6 load tests on your own infrastructure using k6, kubernetes, grafana and influxdb.

Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

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

Comprehensive and user-friendly cloud platform for Load Testing, Speed Testing and Website & API Optimization and Monitoring

Performance testing with Flood increases customer satisfaction and confidence in your production apps and reduces business risk.