Hack is described as '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' and is a Programming Language in the Development category. There are more than 25 alternatives to Hack for a variety of platforms, including Windows, Linux, Mac, BSD and Online / Web-based. The best alternative is Python, which is both free and Open Source. Other great apps like Hack are Java (Free Personal, Open Source), Node.js (Free, Open Source), PHP (Free, Open Source) and Ruby (Free, Open Source).
Ruby is a dynamic, reflective, general purpose object-oriented programming language that combines syntax inspired by Perl with Smalltalk-like features. Ruby originated in Japan during the mid-1990s and was initially developed and designed by Yukihiro "Matz" Matsumoto.
Haskell is an advanced purely-functional programming language. An open-source product of more than twenty years of cutting-edge research, it allows rapid development of robust, concise, correct software.