Hoverfly

Hoverfly is a lightweight, open source API simulation tool. It creates realistic simulations of the APIs an application depends on, replacing slow or unreliable dependencies with reusable simulations.

Simulations can reproduce network latency, random failures or rate limits to test edge cases. They can be exported, shared, edited and imported, and Hoverfly can be extended in any programming language. It provides a command-line interface and native language bindings for Java.

Hoverfly is distributed under the Apache License 2.0 on GitHub. Hoverfly Cloud is a commercial hosted API simulation platform built on it.