Moq (pronounced "Mock-you" or just "Mock") is a mocking library for .NET developed to take advantage of .NET 3.5 and C# 3.0 features (i.e. LINQ expression trees and lambda expressions) ... they claim it's the most productive, type-safe and refactoring-friendly mocking library available.
A custom color picker designed specifically for developers. Makes getting colors out of Photoshop/Acorn mock-ups quick and easy.
Currently supports NSColor, UIColor, CGColorRef, CSS and HTML styles.
This is an extremely cool and useful web application, and if it hasn't been thought of before, I'm absolutely shocked, because it makes so much sense. Essentially, PHPanywhere is a web based free Integrated Development Environment or IDE for the PHP language. In other words it is a web based application that provides PHP developers a PHP code editor that mocks a desktop application, and it does so very well.
One word of caution: the "Typemock Isolator for Open Source" edition is only free to use for developers of open source projects. For Commercial users of any open source project that uses Typemock , it is not free...