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

A java GUI-Less browser, which allows high-level manipulation of web pages, such as filling forms and clicking links; just getPage(url), find a hyperlink, click() and you have all the HTML, JavaScript, and Ajax are automatically processed.

HtmlUnit -  Java GUI-Less browser, supporting JavaScript, to run against web pages 

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

Postman is a powerful HTTP client to help test web services easily and efficiently. Postman let's you craft simple as well as complex HTTP requests quickly. It also saves requests for future use so that you never have to repeat your keystrokes ever again.

Postman - A chrome addon, helps to test 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 

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

Windmill is a web testing tool designed to automate and debug your web application. It provides cross-browser test recorder. It has built-in shell to interact with WIndmill server. Write and run tests from Python, Ruby and Javascript. 
 Github location: <A HREF="https://github.com/windmill/windmill/" target="_blank">https://github.com/windmill/windmill/</A>

Windmill is a web testing tool designed to automate and debug your web application. It provides cross-browser test recorder. It has built-in shell to interact with WIndmill server. Write and run tests from Python, Ruby and Javascript.

Windmill - Web Testing Tool

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

Sahi - Web Automation and Test Tool

Alfajor provides a modern, object-oriented and browser-neutral interface to HTTP resources. Python scripts and test code have a live synchronized mirror of the browser's X/HTML DOM, even with DOM changes made on the client by JavaScript. It has an Api client with native JSON response support useful for testing REST and web API.

Alfajor - Tasty functional testing

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

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

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 

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Postman - Supercharge your API workflow

HtmlUnit - Java GUI-Less browser, supporting JavaScript, to run against web pages