1. Platform independent IDEs for CSharp With platform independent IDEs for CSharp, an independent to platform or platform independent or PIM ,in programming world, is a model designed for the development of software for business or personal use, is a model that can be used in any platform or non specific to a particular platform such as Windows,Linux,Solaris etc. This model is most often utilized as a part of the platform free framework that not only supports operating systems but also the different hardware such as intel, AMD, Sun Micro Framework and so forth. This type of design methodology relates to the Model Driven Engineering. Things that are kept in mind before selecting an IDE Before selecting an independent platform for C#, one thing should be kept in mind that it is a third-party tool , not that from Microsoft. Any latest Microsoft version or new concept may not be supported. Given below are some very good platforms for C# applications development: 2. Offline platforms 1.MonoDevelop: Company claims MonoDevelop enables developers to quickly write desktop and web applications on Linux, Windows and Mac OS X. It also makes it easy for developers to port .NET applications created with Visual Studio to Linux and Mac OS X maintaining a single code base for all platforms. Find details from here 2.Emonic Company claims Emonic (Eclipse-Mono-Integration) is a Eclipse-Plugin for C#. It provides color-highlighting, outline, word- completion and build mechanism via Ant or Nant. Tested on Linux and Windows with Mono and the Win-.net- framework. 3. Find details from here 3.SharpDevelop Company claims: #develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsofts .NET platform. It is open-source, and you can download both sourcecode and executables from this site. In addition, you can find the latest information and changes on #develop, as well as get in touch with the team in the forum. Find details here Online C# Compilers 1.http://www.tutorialspoint.com/codingground.htm 2.http://csharppad.com/ 3.https://compilr.com/ 4.https://ideone.com/