X10 (programming language) is described as 'The X10 programming language is organized around four basic principles of asynchrony, locality, atomicity, and order that are developed on a type-safe, class-based, object-oriented foundation. This foundation is robust enough to support fine-grained concurrency, Cilk-style' and is a programming language in the development category. There are more than 50 alternatives to X10 (programming language) for a variety of platforms, including Windows, Linux, Mac, BSD and Web-based apps. The best X10 (programming language) alternative is Python, which is both free and Open Source. Other great apps like X10 (programming language) are Java, JavaScript, C (programming language) and C++.