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RTL/2

RTL/2 is a high-level programming language used for the development of real-time systems. It is mainly used for designing and implementing time-critical applications such as control systems, embedded systems, and robotics.

Hello, world code example:

TITLE Goodbye World;

LET NL=10;

EXT PROC(REF ARRAY BYTE) TWRT;

ENT PROC INT RRJOB();

    TWRT("Hello world!#NL#");
    RETURN(1);

ENDPROC;

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