The best open source alternative to Java is Python. If that doesn't suit you, our users have ranked more than 50 alternatives to Java and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Java are JavaScript, C#, C++ and Rust.
P is a programming language for asynchronous event-driven programming and the IoT that was developed by Microsoft and University of California, Berkeley.
Pike is a dynamic programming language with a syntax similar to Java and C. It is simple to learn, does not require long compilation passes and has powerful built-in data types allowing simple and really fast data manipulation.
Temper is a programming language and toolchain for making libraries that can be used natively from any other language.
Raku unifies many great ideas that aren't usually found in other programming languages. While several other languages offer some of these features, none of them offer all.
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.
Unison is a statically-typed functional language with type inference, an effect system, and advanced tooling. It is based around a big idea of content-addressed code, in which function are identified by a hash of their implementation rather than by name, and code is stored as...
Pony is an open-source, object-oriented, actor-model, capabilities-secure, high performance programming language.
Hack is a programming language for HHVM that interoperates seamlessly with PHP. Hack reconciles the fast development cycle of PHP with the discipline provided by static typing, while adding many features commonly found in other modern programming languages.
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...
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