MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.
 Features: 
<ul>
 <li>Toggle between HTML, plain text views as well as view the source or email headers</li>
 <li>Test Responsive Emails w/ resizeable preview pane available for 320/480/600px viewports</li>
 <li>Receive and view email attachments</li>
 <li>New emails appear instantly in interface when received (via Websockets)</li>
 <li>Command line interface for configuring SMTP and Web interface ports</li>
 <li>Ability to relay email to an upstream SMTP server (like Gmail)</li>
 <li>Export .eml files</li>
 </ul>

MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.

MailDev - SMTP Server + Web Interface for viewing and testing emails during development

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 

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.

karate - Test Automation Made Simple

Modd is a developer tool that triggers commands and manages daemons in response to filesystem changes.If you use modd, you should also look at devd, a compact HTTP daemon for developers. Devd integrates with modd, allowing you to trigger in-browser livereload with modd.

modd - A flexible tool for responding to filesystem changes

Eruda is a console or developer tools for mobile browsers. It helps to Display JavaScript logs, Check dom state, Check network status, Show localStorage, cookie information, Show url, user agent info, Html, Javascript, css source viewer.
It has plugins to Display page fps and memory, Show performance and resource timing, Run JavaScript code, Visualize touch screen.

Eruda - Console for Mobile Browsers

This is EnvKey's cross-platform native application. It supports Mac, Windows, and Linux. EnvKey is an end-to-end encrypted secrets and configuration management tool. It keeps your configuration securely and automatically in sync for all your developers and servers.

EnvKey - Protect API keys and credentials, Keep configuration in sync everywhere.

Radicle is a peer-to-peer stack for code collaboration. The Radicle stack builds on IPFS, and works without a centralized server. No hassle with setting up your own hosting, and no need to trust companies with your data. It contains a git repository, plus the associated issues and proposals. Access all the issues and proposals associated with your codebase right from your terminal.

Radicle - A peer-to-peer stack for code collaboration

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Projects

MailDev - SMTP Server + Web Interface for viewing and testing emails during development

Hoppscotch - Open source API development ecosystem

karate - Test Automation Made Simple

modd - A flexible tool for responding to filesystem changes

Eruda - Console for Mobile Browsers

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Projects

MailDev - SMTP Server + Web Interface for viewing and testing emails during development

Hoppscotch - Open source API development ecosystem

karate - Test Automation Made Simple

modd - A flexible tool for responding to filesystem changes

Eruda - Console for Mobile Browsers

EnvKey - Protect API keys and credentials, Keep configuration in sync everywhere.

Radicle - A peer-to-peer stack for code collaboration

TechStack

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