Alternatives to REBOL for all platforms with any license

Python

Python is an interpreted, interactive, object-oriented, extensible programming language. It provides an extraordinary combination of clarity and versatility, and is free...

Free Open Source Mac Windows Linux S60 BSD ... AROS Haiku AmigaOS OpenSolaris MorphOS
High Level Object-oriented Language Dynamic typing Garbage Collection ... Modular System Object-oriented Language Rad Add a feature

1160 Like
PHP

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.

Free Open Source Mac Windows Linux BSD PHP
Object-oriented Language Scripting language Add a feature

426 Like
Node.js

Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking...

Free Open Source Mac Windows Linux Chrome OS BSD ... Self-Hosted
Runtime environment Node Based Server-side Add a feature

259 Like
C (programming language)

C is a general-purpose computer programming language. C is one of the most widely used programming languages of all time.

Free Open Source Mac Windows Linux Android iPhone ... Android Tablet BSD iPad AROS Android Wear Haiku Playstation
Notetaking Works at kernel level Compiled Language Inline assembly ... Manual memory management Systems programming Add a feature

283 Like
C++

C++ is a statically typed, free-form, multi-paradigm, compiled, general-purpose, powerful programming language. It is regarded as an intermediate-level language, as it...

Free Open Source Mac Windows Linux BSD
Compiled Language Manual memory management Systems programming Object-oriented Language Add a feature

274 Like
C#

C# is a multi-paradigm programming language encompassing strong typing, imperative, declarative, functional, generic, object-oriented (class-based), and...

Free Open Source Mac Windows Linux BSD
Compiled Language Object-oriented Language Add a feature

188 Like
Ruby

Ruby is a dynamic, reflective, general purpose object-oriented programming language that combines syntax inspired by Perl with Smalltalk-like features. Ruby originated...

Free Open Source Mac Windows Linux BSD Haiku
Blocks Dynamic typing Package Manager Text processing ... Interpreter Object-oriented Language Add a feature

249 Like
Go (Programming Language)

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Free Open Source Mac Windows Linux BSD
Compiled Language Class inheritance Object-oriented Language Performance Monitoring ... Test case management Readability Add a feature

116 Like
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Lua

Lua is a powerful, fast, lightweight, embeddable scripting language. Lua combines simple procedural syntax with powerful data description constructs based on...

Free Open Source Mac Windows Linux Android iPhone ... Android Tablet BSD iPad Android Wear Haiku AmigaOS Playstation MorphOS
Scripting language Embeddable Scripting Configuration Add a feature

150 Like
Perl

Perl is a highly capable, feature-rich programming language with over 30 years of development.

Free Open Source Mac Windows Linux BSD Haiku
Shell integration Add a feature

125 Like