Limbo

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Limbo is a programming language developed by Bell Labs, known for its simplicity and safety features. It is primarily used for writing system software, especially in distributed and concurrent computing environments.

Hello, world:

implement Command;
 
 include "sys.m";
     sys: Sys;
 
 include "draw.m";
 
 include "sh.m";
 
 init(nil: ref Draw->Context, nil: list of string)
 {
     sys = load Sys Sys->PATH;
     sys->print("Hello world!\n");
 }

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