Preloads your application so things like console, rake and tests run faster

Parallel tests across CI server nodes based on each test file's time execution. It generates a test time execution report and uses it for future test runs.

Run Test::Unit / RSpec / Cucumber / Spinach in parallel

Boot any rails app in under a second

A forking Drb spec server

minitest/rspec parallel test runner for CI environments

Distributed test running with autodiscovery via Bonjour (for Cucumber first)

Parallel and Distributed Test Runner for Ruby

Specjour splits your RSpec suite across multiple machines, and multiple cores per machine, to run super-parallel-fast! Also works with Cucumber.

Project Hydra Stack Dependencies

Testbot is a test distribution tool that works with Rails, RSpec, RSpec2, Test::Unit and Cucumber.

RSpec extensions for parallel, distributed execution across hosts, using DRb and Rinda

Integration for zeus and parallel_tests

Spin preloads your Rails environment to speed up your autotest(ish) workflow. By preloading your Rails environment for testing you don't load the same code over and over and over... Spin works best for an autotest(ish) workflow.