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.
Nelua is a systems programming language for performance sensitive applications, like real-time applications and game engines. Its syntax and semantics are similar to Lua, but its garbage collection is optional, it provides optional type notations, and it is free from an...
P is a programming language for asynchronous event-driven programming and the IoT that was developed by Microsoft and University of California, Berkeley.
HolyC is very similar to regular C, so it's a very simple but powerful language. It was used to make all of TempleOS, so it definitely works to make programs.
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.
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.
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.
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...
United States
Sweden
EU
Australia
France