Twist is a product from ThoughtWorks studios that helps in creating and maintaining automated regression suites.
Twist is a test automation and functional testing solution created by ThoughtWorks Studios, the software division of ThoughtWorks. It provides Behavior Driven Development (BDD) and Test-Driven Development (TDD) for functional testing of the application. It is a part of the Adaptive ALM solution consisting of Twist for Agile testing by ThoughtWorks Studios, Mingle for Agile project management and Go for Agile release management.
More details are available here.