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...
Mockbin : Mockbin allows you to generate custom endpoints to test, mock, and track HTTP requests & responses between libraries, sockets and APIs.
httpbin.org : A simple HTTP Request & Response Service.
npoint.io : JSON storage bins with schema validation
Prisma : Prisma turns your database into a powerful GraphQL API which you can either use to build your own GraphQL server or connect to it directly from the fr...
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.