Smalltalk

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Smalltalk is a dynamically-typed, object-oriented programming language known for its simplicity and minimalist syntax. It is primarily used for teaching, research, and creating graphical user interfaces.

Hello, world:

Transcript show: 'Hello world!'; cr.

Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.