mountebank : mountebank is the first open source tool to provide cross-platform, multi-protocol test doubles over the wire. Simply point your application under tes...
Hoppscotch : A free, online, open source API request builder
Telepresence : Telepresence, in conjunction with a containerized development environment, gives the developer a fast development workflow in developing a multi-conta...
YOURLS : YOURLS stands for Your Own URL Shortener. It is a small set of PHP scripts that will allow you to run your own URL shortening service (a la TinyURL or...
WireMock : Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs t...
DuckRails is a development tool.
Its main purpose is to allow developers to quickly mock API endpoints that for many possible reasons can't reach at a specific time.