The Apache JMeter is an open source load testing tool developed by the Apache Foundation that can be used to test performance both on static and dynamic resources. It can be used to simulate a heavy load on a server and also some functional testing. JMeter has an open architecture that can be extended with plugins.
Software Testing Tools: Unit Testing Tools, Functional Testing Tools, Load Testing Tools
SpecFlow is an open source Behavior-Driven Development (BDD) tool for .NET. SpecFlow uses the official Gherkin parser and supports the .NET framework, Xamarin and Mono. You can use SpecFlow to define, manage and automatically execute human-readable acceptance tests in .NET projects. Writing easily understandable tests is a cornerstone of the BDD paradigm and also helps build up a living documentation of your system. Anton Angelov has created a series of articles dedicated to Specflow that starts with an introduction tutorial.
The shift towards mobile platforms is a strong trend currently and Android is the most widely adopted mobile OS with an estimated market share above 80% in 2014. You should naturally test all the apps developed for Android and a large number of open source testing tools and test automation frameworks have been developed to achieve this goal.
In most of your software testing activities, you need data. Sometimes you can rely on a small sample, but if you want to perform some load testing or if you want to test a features that needs to produce a multi-page invoice, then you start to need more than just two or three occurrences. Test data generators are tools that can help you in this task with the automatic generation of hundreds or thousands of customers, products or accounts items with different attributes for their id, email, name, etc.
The software development trend that shifts the target platform from the desktop to web, cloud and mobile applications has fostered the development of load testing services on the web. It is an obvious option to use web-based load testing tools for applications that can be accessed by web users. This article presents the free offers from commercial web load testing services providers.
Database testing is one of the areas that might have the smaller number of open source tools. The programming languages have many xUnit tools and mocking frameworks, but this is not the case for databases. This article provides a list of open source tools that can be used to perform unit, load and security testing on several relational and NoSQL databases.