SharpDevelop
Quote from: SharpDevelop#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 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.
Supported Programming Languages
- C# (Code Completion, Windows Forms Designer)
- VB.NET (Code Completion, Windows Forms Designer)
- Boo (Code Completion, Windows Forms Designer)
- IronPython (Code Conversion, Windows Forms Designer, partial Code Completion)
- IronRuby (Code Conversion, Windows Forms Designer)
- F#
Full Features ListThis isn't no Visual Studio but its a wonderful IDE for those who don't have admin privileges on Windows computers. I use this at school all the time. While it wasn't made specifically for portable usage, it works all the same if you install it to a flash drive or something. It works almost exactly like Visual Studio when it comes to the Form Designer and Code Completion. Its also cross compatible with Visual Studio projects and solutions so you don't have to start your project all over. The only downside is I haven't been able to figure out how to incorporate XNA (for those who are interested). It also seems to load up much faster than VS. If you're looking for on the go, quick C# development, I definitely recommend this tool.
They currently have two supported versions. Older versions exist for older .NET frameworks (2.0 and 1.1 specifically) but these versions aren't supported and I recommend using one of the latest ones anyways.
4.1 Supports .NET 4.0, 3.5, 3.0, and 2.0
3.2 Supports .NET 3.5, 3.0, and 2.0