. NET is a proprietary technology from Microsoft. However, after the conclusion of an agreement with Novell, Mono technology has been recognized as a realization. NET on Unix-like systems (GNU / Linux, Mac OS X). However, the agreement for Novell customers and Novell, as technologies ASP.NET, ADO.NET and Windows.Forms not been standardized by ECMA / ISO and their use in Mono is threatened by claims from Microsoft (the claims are only possible in countries where there are patents on software). Mono provides the implementation of ASP.NET, ADO.NET and Windows.Forms, but at the same time recommends that circumvent these API.

Development environment. NET-applications:
Microsoft Visual Studio (C #, Visual Basic. NET, Managed C + +),
SharpDevelop,
MonoDevelop,
Eclipse,
Borland Developer Studio (Delphi for. NET, C #),
PascalABC.NET etc.