Jnario is a framework for writing executable specifications for Java. It provides all the goodness of Xtend while being specifically tailored to writing acceptance and unit tests. It is easy to integrate as Jnario specifications are compiled to plain Java Junit tests.
SubSpec allows developers to write declarative tests operating at all layers of abstraction consisting of highly composable, small primitive concepts. Based on the powerful xUnit testing framework, SubSpec is easy to integrate with existing testing environments.
Midje is a test framework for Clojure. I created it to support top-down as well as bottom-up testing, to encourage readable tests, to provide a smooth migration path from clojure.test and to support a balance between abstraction and concreteness.
fixture is a python module for loading and referencing test data. It provides several utilities for achieving a fixed state when testing Python programs. Specifically, these utilities setup / teardown databases and work with temporary file systems.
FxObjects is JavaFX Application Framework that enables methodical, pattern based and test friendly way of developing JavaFX applications based on ideas and best practices distilled from real life usage
NSubstitute is a friendly substitute for .NET mocking frameworks. NSubstitute is designed for Arrange-Act-Assert (AAA) testing, so you just need to arrange how it should work, then assert it received the calls you expected once you're done. Because you've got more important code to write than whether you need a mock or a stub.
SilverUnit allows true unit testing in Silverlight. SilverUnit is the first framework that introduces the concept of Crosswise-Isolation: Isolation concepts can be performed for all objects and calls in the system.