.NET Framework is described as 'The .NET Framework is a software framework developed by Microsoft that runs primarily on Microsoft Windows. It includes a large library and provides language interoperability (each language can use code written in other languages) across several programming languages' and is a programming language in the development category. There are more than 10 alternatives to .NET Framework for a variety of platforms, including Windows, Linux, Mac, Web-based and BSD apps. The best .NET Framework alternative is Java. It's not free, so if you're looking for a free alternative, you could try Java or Mono. Other great apps like .NET Framework are Nevron Open Vision for .NET, .NET Micro Framework for Linux, DotNet9x and Eiffel (programming language).
Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.
Mono is a free and open source project led by Xamarin (formerly by Novell and originally by Ximian) to create an Ecma standard compliant .NET Framework-compatible set of tools including, among others, a C# compiler and a Common Language Runtime.
.NET Core is a cross-platform free and open-source managed software framework similar to .NET Framework. It consists of CoreCLR, a complete cross-platform runtime implementation of CLR, the virtual machine that manages the execution of .NET programs.
Nevron Open Vision for .NET is a suite of advanced UI components that helps you develop feature-rich Web (Blazor WebAssenbly) and Desktop (WinForms, WPF, Xamarin.Mac) applications from a single code base.
.NET Micro Framework for Linux (NETMF Linux) is sample porting code including complete OS facility. We provide the code for Eddy, Embedded ARM architecture Linux board. The source codes can be ported to any other architectures and platforms, if the cross-toolchain is available.
Eiffel is an object-oriented programming language designed by Bertrand Meyer (an object-orientation proponent and author of Object-Oriented Software Construction) and Eiffel Software. Meyer conceived the language in 1985 with the goal of increasing the reliability of commercial...
Jabaco is a simple programming language with a Visual Basic like syntax. Jabaco enables you to create powerful software for all Java supported operating systems.
Dolphin is a complete development IDE for Smalltalk targeted specifically at Microsoft Windows. It is capable of creating standalone GUI and console executables that will run on any version of Windows from XP up to the current Windows 10.
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.Net is a framework, Java is a programming language