There are many alternatives to Microsoft Visual Studio for .NET Framework if you are looking for a replacement. The best .NET Framework alternative is MonoDevelop, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Visual Studio and three of them are available for .NET Framework so hopefully you can find a suitable replacement. Other interesting .NET Framework alternatives to Microsoft Visual Studio are SharpDevelop and Microsoft Small Basic.
MonoDevelop enables developers to write desktop and web applications on Linux, Windows and Mac OS X. It also makes it easy to port .NET applications created with Visual Studio to Linux and Mac OS X maintaining a single code base for all platforms.
#develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform. It is open-source, and you can download both sourcecode and executables.
Microsoft Small Basic puts the fun back into computer programming. With a friendly development environment that is very easy to master, it eases both kids and adults into the world of programming.
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I've used MonoDevelop extensively for C# work in Linux. It can work with Visual Studio projects, and much of the shortcut key mappings match Visual Studio. Support for WinForms is available, but there is no viable GUI layout tool/functionality available. A pity that there's no XAML/WPF support under Linux....