Mono is an open source, cross-platform, software development framework developed by Xamarin and the .NET Foundation. It enables developers to easily create cross-platform applications using the same codebase. Mono provides a comprehensive set of APIs and libraries that allow developers to create native applications for Windows, Mac OS X, Linux, iOS and Android. The Mono framework includes a C# compiler, a Common Language Runtime (CLR) and an application framework. It also includes an impressive set of libraries and tools such as the MonoDevelop IDE, the MonoMac UI framework, and the MonoTouch mobile development platform. Mono is supported by a large and active community of developers, and is used in a wide range of industries, from embedded devices to enterprise applications.
Discontinued Motti.NET has been discontinued by allMotti more information here: https://github.com/allmotti/mottidotnet