LightBDD is an open source Behaviour-Driven Development test framework that provides the ability to write tests that are easy to read, easy to track during execution and summarize the test results in user friendly report, while allowing developers to use all of the standard development tools to maintain them. LightBDD provides native support for refactoring, code analysis and test running.

Green Coffee is an open source library that allows you to run your acceptance tests written in Gherkin in your Android instrumentation tests using the step definitions that you declare.

Cucumberish is a test automation framework for Behaviour Driven Development (BDD). It is inspired by the amazing way of writing automated test cases introduced originally in Cucumber using the Gherkin language.

An assertion library for JavaScript and Node.js with a friendly BDD syntax (awesome.must.be.true()). It ships with many expressive matchers and is test runner and framework agnostic. Follows RFC 2119 with its use of MUST. Good stuff and well tested.

YatSpec is an open source library that replaces test tools like Concordion and Fit by allowing your tests to stay maintainable (i.e refactoring support in you favourite IDE) while still producing human readable documentation.

Currently this library supports 3 levels of usage:
* TableRowTest support for JUnit Methods (like in MBUnit / NUnit)
* Specification support for Junit. Produces readable Html from your test
* "Given / When / Then" support with automatic capturing and display of "givens" and captured inputs and output.

ruby-plsql-spec is an open source tool that allows unit testing of Oracle PL/SQL procedures with Ruby libraries:
* ruby-plsql - Ruby API for calling PL/SQL procedures
* RSpec - Ruby testing (or behavior driven development) framework

WebdriverIO lets you control a browser or a mobile application with just a few lines of code. Your test code will look simple, concise and easy to read. WebdriverIO works in combination with most of the TDD and BDD test frameworks in the JavaScript world

Turnip is an open source Gherkin extension for RSpec. It allows you to write tests in Gherkin and run them through your RSpec environment. Basically you can write cucumber features in RSpec.

Cucumber Sandwich generates pretty cucumber html reports on the fly. It monitors your cucumber json report directory for change and then publishes a new report if your report json files change.

Gauge is an open source lightweight cross-platform test automation tool. It provides the ability to author test cases in the business language. Gauge champions the idea of living/executable documentation, following the idea of Behaviour Driven Development (BDD).