MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:1025 instead of your default SMTP server, then check out http://127.0.0.1:1080 to see the mail that's arrived so far.

MailCatcher - Catches mail and serves it through a dream

Metasploit, helps verify vulnerabilities and manage security assessments.  It makes it easy to automate all phases of a penetration test, from choosing the right exploits to streamlining evidence collection and reporting. 

Metasploit Framework - World's most used penetration testing software

Fortio (Φορτίο) started as, and is, Istio's load testing tool and now graduated to be its own project. Fortio runs at a specified query per second (qps) and records an histogram of execution time and calculates percentiles (e.g. p99 ie the response time such as 99% of the requests take less than that number (in seconds, SI unit)). It can run for a set duration, for a fixed number of calls, or until interrupted (at a constant target QPS, or max speed/load per connection/thread).
 
Fortio also includes a set of server side features (similar to httpbin) to help debugging and testing: request echo back including headers, adding latency or error codes with a probability distribution, tcp echoing, tcp proxying, http fan out/scatter and gather proxy server, GRPC echo/health in addition to http, etc.

Fortio (Φορτίο) started as, and is, Istio's load testing tool and now graduated to be its own project. Fortio runs at a specified query per second (qps) and records an histogram of execution time and calculates percentiles (e.g. p99 ie the response time such as 99% of the requests take less than that number (in seconds, SI unit)). It can run for a set duration, for a fixed number of calls, or until interrupted (at a constant target QPS, or max speed/load per connection/thread).

Fortio - Load testing library, command line tool, advanced echo server and web UI in Go

The Grinder is a Java load testing framework that makes it easy to run a distributed test using many load injector machines. Load test anything that has a Java API. This includes common cases such as HTTP web servers, SOAP and REST web services, and application servers (CORBA, RMI, JMS, EJBs), as well as custom protocols. 

 A graphical console allows multiple load injectors to be monitored and controlled, and provides centralised script editing and distribution. Automatic management of client connections and cookies. SSL. Proxy aware. Connection throttling. 

 The Grinder can simulate web browsers and other devices that use HTTP, and HTTPS. It can be used to test Web Service, Database, RPC, POP3, SMTP, FTP, and LDAP.

The Grinder is a Java load testing framework that makes it easy to run a distributed test using many load injector machines. Load test anything that has a Java API. This includes common cases such as HTTP web servers, SOAP and REST web services, and application servers (CORBA, RMI, JMS, EJBs), as well as custom protocols.

Grinder - Java Load Testing Framework

Zope.testbrowser provides an easy-to-use programmable web browser with special focus on testing. It is used in Zope, but it's not Zope specific, it can be used to test or otherwise interact with any web site.

Zope-Testbrowser Programmable browser for functional black-box tests

Capybara aims to simplify the process of integration testing Rack applications such as Rails, Sinatra or Merb. Capybara simulates how a real user would interact with a web application. It is agnostic about the driver running your tests and currently comes with Rack::Test and Selenium support built in. HtmlUnit and env.js are supported through external gems. 

Capybara - Acceptance test framework for web applications 

loadUI deliver a visual, drag-and-drop interface which allows you to create, configure and redistribute your Load Tests interactively and in real-time. You can distribute your Load Tests across any number of loadUI Agents on local or remote machines, allowing you to simulate high volume and real-world load with incredible efficiency. It supprots wide range of protocols and technologies from HTTP(S), HTML, SOAP/WSDL and REST to AMF, JDBC, JMS and POX.
 Sourceforge: <A HREF="http://sourceforge.net/projects/loadui/" target="_blank">http://sourceforge.net/projects/loadui/</A>

loadUI deliver a visual, drag-and-drop interface which allows you to create, configure and redistribute your Load Tests interactively and in real-time. You can distribute your Load Tests across any number of loadUI Agents on local or remote machines, allowing you to simulate high volume and real-world load with incredible efficiency. It supprots wide range of protocols and technologies from HTTP(S), HTML, SOAP/WSDL and REST to AMF, JDBC, JMS and POX.

LoadUI - Load Testing Tool

BeEF is short for The Browser Exploitation Framework. It is a penetration testing tool that focuses on the web browser. BeEF allows the professional penetration tester to assess the actual security posture of a target environment by using client-side attack vectors. Unlike other security frameworks, BeEF looks past the hardened network perimeter and client system, and examines exploitability within the context of the one open door: the web browser. 
 
BeEF will hook one or more web browsers and use them as beachheads for launching directed command modules and further attacks against the system from within the browser context.

BeEF is short for The Browser Exploitation Framework. It is a penetration testing tool that focuses on the web browser. BeEF allows the professional penetration tester to assess the actual security posture of a target environment by using client-side attack vectors. Unlike other security frameworks, BeEF looks past the hardened network perimeter and client system, and examines exploitability within the context of the one open door: the web browser. 

Beef - Browser Exploitation Framework

Jepsen is a Clojure library. A test is a Clojure program which uses the Jepsen library to set up a distributed system, run a bunch of operations against that system, and verify that the history of those operations makes sense. Jepsen has been used to verify everything from eventually-consistent commutative databases to linearizable coordination systems to distributed task schedulers. It can also generate graphs of performance and availability, helping you characterize how a system responds to different faults. 
A Jepsen test runs as a Clojure program on a control node. That program uses SSH to log into a bunch of db nodes, where it sets up the distributed system you're going to test using the test's pluggable os and db. 

Once the system is running, the control node spins up a set of logically single-threaded processes, each with its own client for the distributed system. A generator generates new operations for each process to perform. Processes then apply those operations to the system using their clients. The start and end of each operation is recorded in a history. While performing operations, a special nemesis process introduces faults into the system--also scheduled by the generator. 

Finally, the DB and OS are torn down. Jepsen uses a checker to analyze the test's history for correctness, and to generate reports, graphs, etc. The test, history, analysis, and any supplementary results are written to the filesystem under store/<test-name>/<date>/ for later review. Symlinks to the latest results are maintained at each level for convenience.

Jepsen is a Clojure library. A test is a Clojure program which uses the Jepsen library to set up a distributed system, run a bunch of operations against that system, and verify that the history of those operations makes sense. Jepsen has been used to verify everything from eventually-consistent commutative databases to linearizable coordination systems to distributed task schedulers. It can also generate graphs of performance and availability, helping you characterize how a system responds to different faults.

Jepsen - A framework for distributed systems verification, with fault injection

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

TestCafe is a pure node.js end-to-end solution for testing web apps. It takes care of all the stages: starting browsers, running tests, gathering test results and generating reports. TestCafe doesn’t need browser plugins - it works in all popular modern browsers out-of-the-box. Run your tests in desktop browsers and headless browsers. Connect to remote testing servers, mobile devices and cloud browser farms.

TestCafe - Automated browser testing for the modern web development stack

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

OpenSTA is a distributed software testing architecture designed around CORBA. The current toolset has the capability of performing scripted HTTP and HTTPS heavy load tests with performance measurements from Win32 platforms. Results and statistics are collected during test runs by a variety of automatic and user controlled mechanisms. These can include scripted timers, SNMP data, Windows Performance Monitor stats and HTTP results & timings.

OpenSTA - Open Systems Testing Architecture

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

Sahi - Web Automation and Test Tool

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