Atmosphere is a simply a black-box testing framework for native android applications. You can configure which tests are going to be executed on which device. You can even specify tests to be run on multiple different, in parameters devices, simultaneously. 

Atmosphere - Black box testing framework for Android

GreenMail is an open source, intuitive and easy-to-use test suite of email servers for testing purposes. Supports SMTP, POP3, IMAP with SSL socket support. GreenMail also provides a JBoss GreenMail Service. GreenMail is the first and only library that offers a test framework for both receiving and retrieving emails from Java.

greenmail - Official master for the Greenmail project

Splinter is an open source tool for testing web applications using Python. It lets you automate browser actions, such as visiting URLs and interacting with their items. Splinter is an abstraction layer on top of existing browser automation tools such as Selenium, PhantomJS and zope.testbrowser. It has a high-level API that makes it easy to write automated tests of web applications. It has drivers for Chrome and Firefox for browser-based testing, and zope.testbrowser and PhantomJS for headless testing.
 
Its features include: 
<ul>
<li>simple api</li>
<li>multi webdrivers (chrome webdriver, firefox webdriver, phantomjs webdriver, zopetestbrowser, remote webdriver)</li>
<li>css and xpath selectors</li>
<li>support to iframe and alert</li>
<li>execute javascript</li>
<li>works with ajax and async javascript</li>
</ul>

Splinter is an open source tool for testing web applications using Python. It lets you automate browser actions, such as visiting URLs and interacting with their items. Splinter is an abstraction layer on top of existing browser automation tools such as Selenium, PhantomJS and zope.testbrowser. It has a high-level API that makes it easy to write automated tests of web applications. It has drivers for Chrome and Firefox for browser-based testing, and zope.testbrowser and PhantomJS for headless testing.

Splinter - Python test framework for web applications

Tsung is an open-source multi-protocol distributed load testing tool. It can be used to stress HTTP, WebDAV, SOAP, PostgreSQL, MySQL, LDAP and Jabber/XMPP servers.  The purpose of Tsung is to simulate users in order to test the scalability and performance of IP based client/server applications. You can use it to do load and stress testing of your servers. Many protocols have been implemented and tested, and it can be easily extended. 

Tsung - Distributed Load Testing Tool

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

Mongoaudit not only detects mis-configurations, known vulnerabilities and bugs but also gives you advice on how to fix them, recommends best practices and teaches you how to DevOp like a pro!  There are quite a few holes in its default configuration settings. This fact, combined with abundant lazy system administrators and developers, led to what the press has called the MongoDB apocalypse.

Mongoaudit  - A powerful MongoDB auditing and pentesting tool

Pylot is a free open source tool for testing performance and scalability of web services. It runs HTTP load tests, which are useful for capacity planning, benchmarking, analysis, and system tuning. Pylot generates concurrent load (HTTP Requests), verifies server responses, and produces reports with metrics. Tests suites are executed and monitored from a GUI or shell/console. 

 It supports HTTP and HTTPS. It is multi-threaded and generates real time stats. Response is verified with regular expressions. GUI and Console mode support available.

Pylot is a free open source tool for testing performance and scalability of web services. It runs HTTP load tests, which are useful for capacity planning, benchmarking, analysis, and system tuning. Pylot generates concurrent load (HTTP Requests), verifies server responses, and produces reports with metrics. Tests suites are executed and monitored from a GUI or shell/console.

Pylot - Performance & Scalability Testing of Web Services

Webrat helps to write expressive and robust acceptance tests for a Ruby web application. It supports multiple Ruby web frameworks like Rails, Merb and Sinatra. It also supports popular test frameworks like RSpec, Cucumber, Test::Unit and Shoulda.

Webrat - Ruby Acceptance Testing for Web applications 

HTTPolice is a lint for HTTP requests and responses. It checks them for conformance to standards and best practices. As a command-line tool, it can read HAR files or raw HTTP/1.x TCP streams. HTTPolice just analyzes anything you feed into it. Thus, it can be used on requests and responses captured from a real process or test suite.

HTTPolice - Lint for HTTP requests and responses

A sendmail replacement which forwards mail to an SMTP server.

mhsendmail -  sendmail for MailHog

Japa is an API-first testing framework. It focuses only on testing Node.js (backend) applications, thus resulting in a fast, small, and simple tests runner. 
<ul>
<li>Support for <a href="https://japa.dev/grouping-tests" rel="nofollow">test groups</a>, timeout, todo tests and <a href="https://japa.dev/underlying-test-class#fails" rel="nofollow">regression tests</a>.</li>
<li>Support for <a href="https://japa.dev/datasets" rel="nofollow">Datasets</a>.</li>
<li>Assertion libraries with support for <a href="https://japa.dev/assertion-planning" rel="nofollow">assertion planning</a>.</li>
<li>Ability to <a href="https://japa.dev/filtering-tests" rel="nofollow">filter</a> and run specific or only failing tests.</li>
<li>Re-imagined <a href="https://japa.dev/lifecycle-hooks" rel="nofollow">lifecycle hooks</a>.</li>
<li>Multiple <a href="https://japa.dev/plugins/spec-reporter" rel="nofollow">reporters</a> to display tests progress.</li>
<li>Great CLI experience with pretty diffs and formatted error stacks.</li>
<li>Works with ESM and <a href="https://japa.dev/usage-with-typescript" rel="nofollow">TypeScript</a> both with zero additional setup.</li>
</ul>

Japa is an API-first testing framework. It focuses only on testing Node.js (backend) applications, thus resulting in a fast, small, and simple tests runner. 

Japa - API-first testing framework

The WebLOAD Open Source Load Generation Engine is an open source project sponsored by RadView Software. This project is intended for ISVs, SIs and software developers who need to integrate a professional load generation engine into their applications.

WebLoad - The best LoadRunner Alternative 

Scenarigo is a scenario-based API testing tool for HTTP/gRPC server. It is written in Go, enable to customize by the plugin package of Go. You can write test scenarios as YAML files and executes them.

Scenarigo - An end-to-end scenario testing tool for HTTP/gRPC server

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