CSI for Unity 3D is a simple C# code interpreter that executes inside the Unity 3D runtime environment. It can be used during game-play to evaluate and influence the state of game objects and components while using the familiar C# syntax and .NET/Mono Framework. The code is released as Open Source and the project is available under the MIT/X11 License.
A more detailed description of the C# Interpreter Console for Unity 3D is available on the project's home page at:
http://blog.tiaan.com/link/2010/03/15/csharp-interpreter-unity-plugin-console-debugger
The documentation includes information about installation, usage, the runtime user-interface, the syntax used by the interpreter, configuration options, and so on.
The open-source files are available as a Unity package and in raw code format at GitHub as well as from the project's home page.