(Unit) Testing
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CppUnit
Jasmine
JUnit
Mocha
NUnit
PHPUnit
QUnit
Spock Framework
TestNG
xUnit.net
Testing Libraries
AssertJ
Capybara
Code Contracts for .NET
Cofoja: Contracts for Java
Dumbster Email Testing
Fluent Assertions
HtmlUnit
junit-quickcheck
netDumbster
RestAssured
Timecop
WireMock
Mocking Frameworks
EasyMock
FakeItEasy
jMock
Fake Function Framework (fff)
Mockito
Moq
PowerMock
Behavior-driven Design, ATDD, Spec by Example
Concordion
Cucumber
FitNesse
RSpec
Specflow
Generative Testing
Model-based Testing
Combinatorial Testing
Advanced Combinatorial Testing System (ACTS)
ALLPAIRS Test Case Generation Tool
UI and Mobile Testing
Appium
Geb
Nightwatch.js
Watir
WebDriver
Zombie.js
Provisioning, Containers, and Service Templates
Ansible
Chef
Docker
Dropwizard
Jetty
Puppet
Spring Boot
Vagrant
Performance Testing
Other
Checker Framework
Guava: Google Core Libraries for Java 1.6+
HSQLDB
Spec#
Sikuli