WireMock : Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs t...
Grafana k6 : Grafana k6 is an open-source, developer-friendly, and extensible load testing tool. k6 allows you to prevent performance issues and proactively improv...
httpbin.org : A simple HTTP Request & Response Service.
Cool QL Cool : CoolQLCool (CQC) is an open source GraphQL server that allows you to turn websites into GraphQL APIs.
BlurHash : BlurHash is a compact representation of a placeholder for an image.
Mockoon is the easiest and quickest way to design and run mock APIs. No remote deployment, no account required, free and open-source.