MockMockWeb is a Heroku-ready Node.js-based Web application server which allows you to mock up a website in seconds. It allows you to instantly launch a website which sends an empty page (with status 200) to any request/URL and edit any page on the spot. You can also edit the layout shared throughout your website. It lets you build a mock (sometimes real) website in a request-driven interaction.
cmocka is a unit testing framework for C with mock objects. There are a variety of C unit testing frameworks available supporting different platforms and compilers. Some development requires a lot of different compilers and older versions, which makes it difficult to use unit testing frameworks. The idea of CMocka is that a test application only requires the standard C library and CMocka itself to minimize the conflicts with standard C library headers, especially on a lot of different platforms.
Flexmock is a mock/stub/spy library for Python. Its API is inspired by a Ruby library of the same name. However, it is not a goal of Python Flexmock to be a clone of the Ruby version. Instead, the focus is on providing full support for testing Python programs and making the creation of fake objects as unobtrusive as possible. Flexmock’s design focuses on simplicity and intuitiveness. This means that the API is as lean as possible, though a few convenient short-hand methods are provided to aid brevity and readability. Flexmock declarations are structured to read more like English sentences than API calls, and it is possible to chain them together in any order to achieve high degree of expressiveness in a single line of code.