Roughdraft.js
Quickly create an interactive HTML mock-up by auto sourcing lorem ipsum/images generators, with minimal html markup, and no server side code
Thrill
Runs tests in many browsers.
Mocha
A simple, flexible, fun javascript test framework for node.js & the browser. (BDD, TDD, QUnit styles via interfaces)
Holder
Holder renders image placeholders entirely on the client side.
Jasmine Ajax
jasmine-ajax - A library for faking Ajax responses in your Jasmine suite.
Boomerang
End user oriented web performance testing and beaconing
Jasmine
DOM-less simple JavaScript testing framework
Wire
A light, fast, flexible Javascript IOC container
Qunit
An easy-to-use JavaScript Unit Testing framework.
Hashgrid
A little tool that inserts a layout grid in web pages, allows you to hold it in place, and toggle between displaying it in the foreground or background.