API Testing Platform that automatically generates unit test cases with dependency mocks from API calls

Realistic performance testing with unrivaled reporting. Develop locally, scale globally, and retain full access to all your data. 100% Open Source.

Hand-crafted lightweight Rest Client for testing APIs. Supports collections, environments, git collaboration and local storage.

Testing and validating REST services in Java is harder than in dynamic languages such as Ruby and Groovy. REST Assured brings the simplicity of using these languages into the Java domain.

Requestly is an open-source tool that simplifies API development, testing, mocking, and integration for developers and QAs.

Loader.io is a free load testing service that allows you to stress test your web-apps & apis with thousands of concurrent connections.