Dylan

If you are in search of an advanced, object-oriented, dynamic language suitable for rapid program development, look no further than Dylan. One of the most notable features of this language is the option to later optimize programs for more efficient execution by supplying type information to the compiler.

Moreover, nearly all entities in Dylan - from functions, classes, to basic data types like integers - are first class objects. This versatile language also supports multiple inheritance, polymorphism, multiple dispatch, keyword arguments, object introspection and many other advanced features.

Such a range of features makes Dylan an ideal language for experienced programmers who demand a quality tool. Whether or not you are an expert in programming, Dylan is a fantastic way to improve your coding skills with endless customization options. As one of the few languages that excels in both development speed and execution efficiency, Dylan is an excellent choice.