Top Alternatives to jRuby

Java is a widely-used, object-oriented, general-purpose programming language designed to have as few implementation dependencies as possible. Its core principle, "write once, run anywhere" (WORA), allows compiled Java code to run on any platform that supports Java without the need for recompilation.

JavaScript is a versatile, high-level programming language primarily used for creating dynamic and interactive web content. It runs directly in web browsers and is a fundamental technology alongside HTML and CSS.

Lua is a powerful, fast, and lightweight scripting language designed for embedding in applications. It's known for its simplicity, portability, and efficiency, making it ideal for a wide range of uses from embedded systems to game development and configuration.

Scala is a powerful, general-purpose programming language designed to combine the best features of object-oriented and functional programming paradigms.

FreeBASIC is a free and open-source multiplatform BASIC compiler. It supports a wide range of operating systems including Windows, Linux, and macOS (via third-party ports), facilitating cross-platform development. It's designed to be highly compatible with QuickBASIC while offering numerous modern features like object-oriented programming, manual memory management, and support for graphics and sound libraries, making it suitable for various programming tasks from system utilities to game development.

REBOL is a lightweight, cross-platform language designed for data exchange, networking, and distributed computing. It's known for its expressive syntax and focus on dialects for various tasks, making it suitable for scripting and building domain-specific applications.

Kotlin is a modern, statically-typed programming language developed by JetBrains. It runs on the Java Virtual Machine (JVM), Android, and the web (via JavaScript), and can compile to native code. Designed for concise, safe, and interoperable code, Kotlin aims to make programming more enjoyable and productive.