Gatling is an open-source load testing framework based on Scala, Akka and Netty. 
 

Gatling -  Stress Testing Tool

Ginkgo is a BDD-style Go testing framework built to help you efficiently write expressive and comprehensive tests. It is best paired with the Gomega matcher library but is designed to be matcher-agnostic.

Ginkgo - BDD Testing Framework for Go

Linux Desktop Testing Project is aimed at producing high quality test automation framework (using GNOME / Python) and cutting-edge tools that can be used to test Linux Desktop and improve it. It uses the Accessibility libraries to poke through the application's user interface. We strive to help in building a quality desktop. The GNU LDTP core framework uses Appmap and the recorded test-cases to test an application and then gives the status of each test-case as output. As of now, GNU LDTP can test any GNOME-based GUI applications, which are accessibility-enabled, Mozilla, Openoffice.org, any Java application (should have a UI based on swing) and KDE 4.0 applications based on QT 4.0 (based on the press releases by KDE). 
 Its features include
 <UL>
	<LI>LDTP concepts are derived from <a class="http" href="http://safsdev.sourceforge.net/Default.htm">Software Automation Framework Support</a></LI>
	<LI>LDTP supports verification of actions performed (guiexist, verifystate, etc)</LI>
	<LI>Writing test scripts are very easy, the script writer need not know about the object hierarchy </LI>
	<LI>CPU / Memory performance monitoring of application-under-test can be measured</LI>
	<LI>From the XML log, we can gather HTML report using XSLT</LI>
	<LI>Group based execution, which provides precise control on the flow of test-script execution</LI>
	<LI>Scripts can be written as a reusable component and for that the data can be stored / retrieved in XML</LI>
	<LI>User-friendly Text Editor with syntax highlighting for generating and grouping test data</LI>
	<LI>Objects are identified both statically and dynamically</LI>
	<LI>Record / Playback</LI>
 </UL>

 Moderator comments: Ubuntu, GNOME are using this framework.

Linux Desktop Testing Project is aimed at producing high quality test automation framework (using GNOME / Python) and cutting-edge tools that can be used to test Linux Desktop and improve it. It uses the Accessibility libraries to poke through the application's user interface. We strive to help in building a quality desktop.

Linux Desktop Testing Project

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

OpenMOLE (Open MOdeL Experiment) makes it simple to execute your programs on distributed computing environments. If you want to execute the same program for many different inputs (parameters or datasets).  The typical usages of OpenMOLE are high performance model calibration, model exploration, machine learning, optimization, data processing. It is a scientific workflow engine that works with your own programs and on your own execution environments.

OpenMOLE - Execute programs on distributed computing environments

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

Appium is an open-source project and ecosystem of related software, designed to facilitate UI automation of many app platforms, including mobile (iOS, Android, Tizen), browser (Chrome, Firefox, Safari), desktop (macOS, Windows), TV (Roku, tvOS, Android TV, Samsung), and more.
Appium is used mostly in the field of software test automation, to help determine whether the functionality of a given app is working as expected. In contrast to other types of software testing, UI automation allows testers to write code that walks through user scenarios in the actual UI of an application, mimicking as closely as possible what happens in the real world while enabling the various benefits of automation, including speed, scale, and consistency.
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Appium is an open source, cross-platform test automation tool for native, hybrid and mobile web apps, tested on simulators (iOS, FirefoxOS), emulators (Android), and real devices (iOS, Android, FirefoxOS).

Appium - UI Automation for Apps

Sahi is an automation and testing tool for web applications, with the facility to record and playback scripts. 

Sahi - Web Automation and Test Tool

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

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

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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Gatling - Stress Testing Tool