The first fetch/XMLHttpRequest network-mocking library that's actually user-friendly

Light-weight (as light as hydrogen) unit test framework for C/C++, since 2012

A dynamic mock tool to response http request

Optimus is a dynamic mock tool for retrofit

Service virtualization is the simulation of the behavior of software components that are unavailable or otherwise restricted during the preproduction stage of the software development lifecycle. 

Mockpit: Create dynamic REST API mocks with JavaScript-based response generation. Extract path variables, query parameters, use references, and configure headers. Export, import, and search mocks.

A data mock application based on time sequence