NetPad
A cross-platform C# editor and playground
...Open NetPad, start coding, hit Run, and see your output immediately. It's that simple. Quickly prototype and test code snippets before incorporating them into your projects. Visualize data interactively for better insights and analysis. Query databases using LINQ or SQL effortlessly. Experiment with new C# features or start learning C# in an intuitive and accessible environment. Create and save your own utility or administration scripts for repeated use.