Julia Language

The Julia dynamic, technical language, for efficient, distributed development. It also built on LLVM, and has the beautiful IJulia interface. From the homepage:

• Multiple dispatch: providing ability to define function behavior across many combinations of argument types
• Dynamic type system: types for documentation, optimization, and dispatch
• Good performance, approaching that of statically-compiled languages like C
• Built-in package manager
• Lisp-like macros and other metaprogramming facilities
• Call Python functions: use the PyCall package
• Call C functions directly: no wrappers or special APIs
• Powerful shell-like capabilities for managing other processes
• Designed for parallelism and distributed computation
• Coroutines: lightweight “green” threading
• User-defined types are as fast and compact as built-ins
• Automatic generation of efficient, specialized code for different argument types
• Elegant and extensible conversions and promotions for numeric and other types
• Efficient support for Unicode, including but not limited to UTF-8
• MIT licensed: free and open source