#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.

We are going to add more content (and new releases) over the coming months, so sign up for our announcement list! Also, we want to invite you to participate in the forums, discussing SharpDevelop - its features, feature requests and of course bugs.

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 CodeCompletion)
IronRuby (Code Conversion, Windows Forms Designer)
F#

Designers and Frameworks
Windows Presentation Foundation (WPF)
Windows Forms
ASP.NET MVC
Entity Framework (EF EDM Designer)

Developer Productivity
Refactoring
Parallel build support for multi-core machines
NuGet and T4 support
Multi-framework targetting (.NET 4.0, as well as 2.0, 3.0 and 3.5)
Code Autoinsert More information
Starts from a USB memory stick
Read-only project support
Full MSBuild support

Quality Tools
Integrated Debugger (including dynamic debugging features)
Code Analysis (FxCop)
Unit Testing (NUnit)
Code Coverage (PartCover)
Profiler (Roadmap)
Integrated Subversion support (TortoiseSVN)
Integrated Git support
StyleCop addin

And More...
Setup projects (WiX)
SharpDevelop Reports .NET open-source reporting solution
Parser-based code converter (Online Code Converter)
XML "code completion"
Documentation generation (Sandcastle, SHFB)
Reflector addin
Easy addin extensibility mechanism
SharpDevelop for Applications (SDA) allows you to host SharpDevelop in your applications
AvalonEdit WPF-based text editor is rehostable to add a programmer's editor to your applications (including code completion!)

In the Source Code Download
VC++ project support
Mono support
Snippet Compiler
More Reuse and Extensibility examples

Home:

http://www.icsharpcode.net/OpenSource/SD/Default.aspx

Download:

 http://www.icsharpcode.net/OpenSource/SD/Download/#SharpDevelop5x (net framework 2.0 to 4.5.1)