[_delirium]

It sounds like you might be asking about what's often called "rapid prototyping". That doesn't cover every possible case (e.g. adding a new feature to a large existing system is not usually covered by "rapid prototyping"), but I think it points to the languages that tend to emphasize ease-of-getting-something-out. Python and Ruby are often promoted in that category. Delphi used to be big, but is waning.