EXTasy is a Cucumber-like BDD tool for ExtJS developers. It is written in python and built on top of Pycukes

Appium is an open source test automation tool for use with native and hybrid mobile apps. It drives iOS and Android apps using the WebDriver JSON wire protocol. Appium aims to automate any mobile app from any language and any test framework, with full access to back-end APIs and DBs from test code.

Lettuce is a very simple BDD tool based on the Cucumber. It provides to the developers the ability of describing features in a natural language, by creating one or more scenarios. Each scenario has one possible behaviour of the feature you want to implement. To make the scenarios run python code, it is necessary to define steps.

NModel is a model-based testing and analysis framework for model programs written in C#.

This provides a BDD syntax for testing your Go code

Sikuli is a visual technology to automate and test graphical user interfaces (GUI) using images (screenshots). Sikuli includes Sikuli Script, a visual scripting API for Jython, and Sikuli IDE, an integrated development environment for writing visual scripts with screenshots easily.

Arquillian enables you to test your business logic in a remote or embedded container. Alternatively, it can deploy an archive to the container so the test can interact as a remote client. The mission of the Arquillian project is to provide a simple test harness that abstracts away all container lifecycle and deployment from the test logic so developers can easily produce a broad range of integration tests for their enterprise Java applications.

Feed4TestNG makes it easy to write parameterized tests for the TestNG framework and feed them with predefined or random test data. It enables you to improve your testing easily.

Jody is a basic BDD framework to work with node.js so that I can learn a bit of javascript and node. Adds a method on to all objects to test using should(). It can test callbacks and events.

Arepa is a lightweight non-invasive tool that helps you to implement Behavior Driven Development (BDD) on .NET projects. Arepa produces guidelines of using BDD on your current tests, and customisable and portable test reports integrating XML Documentation Comments. It's developed in C# using Scrum and BDD.