Hoppscotch is an open source API development ecosystem. It is light weight and can send fast requests and get/copy responses in real-time. It supports WebSocket, Server Sent Events, Socket.IO, MQTT and GraphQL. You can also install as a PWA (Progressive Web App) on your device.

Hoppscotch - Open source API development ecosystem 

Swagger is a powerful open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs. The goal of Swagger is to define a standard, language-agnostic interface to REST APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. 

Swagger - The World's Most Popular API Framework

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Powerful JSON & XML assertions are built-in, and you can run tests in parallel for speed.
 
Test execution and report generation feels like any standard Java project. But there’s also a stand-alone executable for teams not comfortable with Java. You don’t have to compile code. Just write tests in a simple, readable syntax - carefully designed for HTTP, JSON, GraphQL and XML. And you can mix API and UI test-automation within the same test script.

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Powerful JSON & XML assertions are built-in, and you can run tests in parallel for speed.



karate - Test Automation Made Simple

Codeception is a modern full-stack testing framework for PHP. Inspired by BDD, it provides an absolutely new way of writing acceptance, functional and even unit tests. Powered by PHPUnit. Codeception provides high-level domain language for tests. Tests are represented as a set of user's actions. Tests can be executed using Firefox, Chrome, Safari or Cloud Testing services with Selenium WebDriver. Browser can be emulated with HTTP-requests through CURL with PhpBrowser. 
 
Codeception simplifies REST and SOAP testing. There are flexible commands to test structure and data of JSON and XML responses. Testing can be done over HTTP or inside a framework.

Codeception is a modern full-stack testing framework for PHP. Inspired by BDD, it provides an absolutely new way of writing acceptance, functional and even unit tests. Powered by PHPUnit.  Codeception provides high-level domain language for tests. Tests are represented as a set of user's actions.  Tests can be executed using Firefox, Chrome, Safari or Cloud Testing services with Selenium WebDriver. Browser can be emulated with HTTP-requests through CURL with PhpBrowser. 

Codeception - Full-stack testing PHP framework

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed.
 
Its features include: 
<ul>
<li>Scripts are plain-text, require no compilation step or IDE, and teams can collaborate using Git / standard SCM</li>
<li>Elegant&nbsp;<a href="https://en.wikipedia.org/wiki/Domain-specific_language">DSL</a>&nbsp;syntax &lsquo;natively&rsquo; supports JSON and XML - including&nbsp;<a href="https://karatelabs.github.io/karate/#set">JsonPath</a>&nbsp;and&nbsp;<a href="https://karatelabs.github.io/karate/#xpath-functions">XPath</a>&nbsp;expressions</li>
<li>Tests are super-readable - as scenario data can be expressed in-line, in human-friendly&nbsp;<a href="https://karatelabs.github.io/karate/#json">JSON</a>,&nbsp;<a href="https://karatelabs.github.io/karate/#xml">XML</a>, Cucumber&nbsp;<a href="https://karatelabs.github.io/karate/#the-cucumber-way">Scenario</a>&nbsp;Outline&nbsp;<a href="https://karatelabs.github.io/karate/#table">tables</a>, or a&nbsp;<a href="https://karatelabs.github.io/karate/#set-multiple">payload builder</a>&nbsp;approach&nbsp;<a href="https://gist.github.com/ptrthomas/d6beb17e92a43220d254af942e3ed3d9">unique to Karate</a></li>
<li><a href="https://github.com/intuit/karate/wiki/IDE-Support#vs-code-karate-plugin">Fully featured debugger</a>&nbsp;that can step&nbsp;backwards&nbsp;and even&nbsp;<a href="https://twitter.com/KarateDSL/status/1167533484560142336">re-play a step while editing it</a>&nbsp;- a&nbsp;huge&nbsp;time-saver</li>
<li>Ideal for testing the highly dynamic responses from&nbsp;<a href="http://graphql.org/">GraphQL</a>&nbsp;API-s because of Karate&rsquo;s built-in&nbsp;<a href="https://karatelabs.github.io/karate/#text">text-manipulation</a>&nbsp;and&nbsp;<a href="https://github.com/json-path/JsonPath#path-examples">JsonPath</a>&nbsp;capabilities</li>
<li>Re-use of payload-data and user-defined functions across tests is&nbsp;<a href="https://karatelabs.github.io/karate/#reading-files">so easy</a>&nbsp;- that it becomes a natural habit for the test-developer</li>
<li>Support for&nbsp;<a href="https://karatelabs.github.io/karate/#data-driven-tests">data-driven tests</a>&nbsp;and being able to&nbsp;<a href="https://karatelabs.github.io/karate/#tags">tag or group</a>&nbsp;tests is built-in, no need to rely on an external framework</li>
<li>Multi-threaded&nbsp;<a href="https://karatelabs.github.io/karate/#parallel-execution">parallel execution</a>, which is a huge time-saver, especially for integration and end-to-end tests</li>
<li>Option to use as a light-weight&nbsp;<a href="https://github.com/intuit/karate/tree/master/karate-netty#standalone-jar">stand-alone executable</a>&nbsp;- convenient for teams not comfortable with Java</li>
<li>Cross platform&nbsp;<a href="https://karatelabs.github.io/karate/karate-robot">Desktop Automation</a>&nbsp;that can be&nbsp;<a href="https://twitter.com/ptrthomas/status/1215534821234995200">mixed into Web Automation flows</a>&nbsp;if needed</li>
<li>Gatling integration can hook into&nbsp;<a href="https://github.com/intuit/karate/tree/master/karate-gatling#custom">any&nbsp;custom Java code</a>&nbsp;- which means that you can perf-test even non-HTTP protocols such as&nbsp;<a href="https://github.com/thinkerou/karate-grpc">gRPC</a></li>
<li><a href="https://karatelabs.github.io/karate/karate-mock-servlet">Mock HTTP Servlet</a>&nbsp;that enables you to test&nbsp;any&nbsp;controller servlet such as Spring Boot / MVC or Jersey / JAX-RS - without having to boot an app-server, and you can use your HTTP integration tests un-changed</li>
<li>&nbsp;</li>
</ul>

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed.

Testing and validation of REST services in Java is harder than in dynamic languages such as Ruby and Groovy. REST Assured brings the simplicity of using these languages into the Java domain.

Rest-assured - Java DSL for easy testing of REST services

PostWoman is an API request builder which is a free, fast, and beautiful alternative to Postman. It is lightweight, Crafted with minimalistic UI design. Faster, lighter, cleaner, minimal & responsive.  Send requests and get/copy responses in real-time. 


PostWoman - API request builder - A free, fast, and beautiful alternative to Postman

Insomnia is a powerful HTTP and Rest client built on top of Electron. You can quickly and easily send REST, SOAP, GraphQL, and GRPC requests directly within Insomnia. Accelerate your teams through spec-driven design-first API development. Catch issues earlier, centralize standards, and adopt an API workflow that works with your existing tools. Automate manual API tests and integrate with your CI/CD process to build out an API testing pipeline using Insomnia Unit Tests and Inso, the Insomnia CLI.

Insomnia -  The Open Source API Client and Design Platform for GraphQL, REST and gRPC

Postman helps you be more efficient while working with APIs. Using Postman, you can construct complex HTTP requests quickly, organize them in collections and share them with your co-workers.

Postman -  Supercharge your API workflow

SoapUI is the Functional Testing tool for SOAP and REST testing. With its easy-to-use graphical interface, and enterprise-class features, SoapUI allows you to easily and rapidly create and execute automated functional, regression, and load tests. In a single test environment, SoapUI provides complete test coverage - from SOAP and REST-based Web services, to JMS enterprise messaging layers, databases, Rich Internet Applications, and much more. 

SoapUI - Functional testing solution for APIs and web services

Keploy is a no-code testing platform that generates tests from API calls. It converts API calls into testcases. Mocks are automatically generated with the actual request/responses.
 
It can automatically mock network/external dependencies with correct responses. No more manually writing mocks for dependencies like DBs, internal services, or third party services like twilio, shopify or stripe. It can safely replay writes or mutations by capturing from local or other environments. 
 
It also does automatic instrumentation for popular libraries/drivers like sql, http, grpc, etc. Web Console is available to visually understand the results, update behaviour and share findings across your team.

Keploy is a no-code testing platform that generates tests from API calls. It converts API calls into testcases. Mocks are automatically generated with the actual request/responses.

Keploy - No code API testing platform. Create unit tests and data mocks from API calls

Smocker (server mock) is a simple and efficient HTTP mock server. Smocker exposes two ports: Port 8080 is the mock server port. It will expose the routes you register through the configuration port and Port 8081 is the configuration port. It's the port you will use to register new mocks. This port also exposes a user interface.

Smocker - Simple and efficient HTTP mock server

Powerful declarative end-to-end testing for APIs that works for you! No coding required. Simple to run on any continuous integration tool. Model complex real world customer flows with multiple steps with our extensive declarative syntax.

apid - Declarative API end to end testing framework

RestesterUI is a web-based web service testing tool written in JavaScript. It allows to make test cases in order to validate APIs.


RestesterUI - Web-based web service testing tool written in JavaScript

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Hoppscotch - Open source API development ecosystem

Swagger - The World's Most Popular API Framework

karate - Test Automation Made Simple

Codeception - Full-stack testing PHP framework

karate - Test Automation Made Simple

Rest-assured - Java DSL for easy testing of REST services

PostWoman - API request builder - A free, fast, and beautiful alternative to Postman

Insomnia - The Open Source API Client and Design Platform for GraphQL, REST and gRPC

Postman - Supercharge your API workflow

SoapUI - Functional testing solution for APIs and web services

Keploy - No code API testing platform. Create unit tests and data mocks from API calls

Smocker - Simple and efficient HTTP mock server

apid - Declarative API end to end testing framework

RestesterUI - Web-based web service testing tool written in JavaScript

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