WireMock : Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs t...
Postal : Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready f...
Motty : Motty provides the simpler way to test your client services.
It is a web application which gives you ability to create your own custom responses.
So y...
Matrix : Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distribu...
npoint.io : JSON storage bins with schema validation
Mockoon is the easiest and quickest way to design and run mock APIs. No remote deployment, no account required, free and open-source.