SharpDevelop 1.1 (Windows)

SharpDevelop is a free IDE for C# and VB.NET projects on Microsoft's .NET platform. Its features: forms designer for C# and VB.NET; code completion for C# and VB.NET (including Ctrl+Space support); XML editing; folding; code autoinsert (Alt+Ins); C# to VB.NET converter, as well as VB.NET to C# converter; completely written in C#; compile C# and VB.NET in the IDE out-of-the-box; open source, GPL licensed; ILAsm and C++ backends; integrated NUnit support; assembly analyzer; XML documentation preview; user interface translated to many languages; everything templated: add new project or file types, or even compilers to SharpDevelop.