Mockoon is a free and open source desktop application allowing to quickly mock servers and APIs. It packs some great features: - Create unlimited mocks and routes. - Import/export Swagger/OpenAPI specifications files. - Serve multiple rules-triggered responses for each route. - Incoming requests and outgoing responses are logged for easier debugging. - Redirect all non-defined routes to the specified host with proxy mode. - Serve dynamic content by using the templating system.