SharpDevelop at gos.i
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SharpDevelop

SharpDevelop (also styled as #develop) is a free and open source integrated development environment (IDE) for the Microsoft .NET, Mono, Gtk# and Glade# platforms, and supports development in C#, Visual Basic .NET, Boo, F#, IronPython and IronRuby programming languages.

It was designed as a free and lightweight alternative to Microsoft Visual Studio, and contains an equivalent feature for almost every important Visual Studio feature, including the GUI Designer, Code/Design views, Syntax highlighting, Auto completion menus (similar to IntelliSense) the ability to compile and debug form/console .NET Framework applications, the New Project wizard, Toolbars, Menus, Panels, and even the Panel docking system. To allow for quick migration, SharpDevelop works natively with Visual Studio project and code files. It is able to compile applications for many .NET Framework versions, including 2.0, 3.0 and 3.5 and 4.0 and the .NET Compact Framework 2.0 and 3.5