Client–server app

Create with the largest collection of high-quality images that are free to use. Trusted by Trello, Medium, and thousands of other API applications to power their free picture needs.

Free and startup-friendly currency converter JSON API for real-time and historical exchange rates - reliable and accurate, supporting 168 world currencies.

Mongoose - an open source web server, MQTT and Websocket library for embedded devices. On the market since 2004, adopted by thousands of businesses worldwide.

Documentation for unFTP

The Service Mesh and API Platform for Kubernetes, Zero-Trust, Microservices

Send HTTP requests using this open source application

We provide Skype Resolver API, Weather API, Cheap API, Email2Skype, IP2Skype, Skype2Email, Skype bot source and much more...

Simplify API development for users, teams, and enterprises with our open source and professional toolset. Find out how Swagger can help you and get started today.

Web site created using create-react-app

HTTP client for the browser and node.js

Formspree is a form backend, API, and email service for HTML & JavaScript forms. It’s the simplest way to embed custom contact us forms, order forms, or email capture forms on your static website.

Helps you create requests faster, saving precious time on development.

Apollo Data Graph Platform— unify APIs, microservices, and databases into a data graph that you can query with GraphQL

Replicate your SaaS data to a follower Postgres database in real-time.

Postman makes API development easy. Our platform offers the tools to simplify each step of the API building process and streamlines collaboration so you can create better APIs faster.

Leading Open Source API Client, and Collaborative API Design Platform for REST, SOAP, GraphQL, and GRPC

Paw is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions.

SoapUI is the world's most widely-used automated testing tool for SOAP and REST APIs. Write, run, integrate, and automate advanced API Tests with ease. See why millions of users trust SoapUI for testing their APIs today!

CLI HTTP that will make you smile. JSON and sessions support, syntax highlighting, wget-like downloads, plugins, and more.

glFTPd - A great FTP server for anyone on a *NIX platform.

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