This is a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform.
DOWNLOAD
Free
#develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform.
It supports the development of applications written in C#, Visual Basic.NET, Boo and IronPython.
It is open source and written in C#. It provides all of the features required from a modern Windows IDE, such as code completion, project templates, an integrated debugger and a forms designer. It has good compatibility with Visual Studio Express and Visual Studio 2008 by using the same project and solution file format.
DOWNLOAD
Free
Can it be used for commercial purposes?
Royalty free, fast, user friendly, stable.