BCPL

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BCPL is a general-purpose programming language with a small instruction set, primarily used for systems programming and compiler implementation.

Hello, world:

GET "libhdr"

LET start() = VALOF
{ writef("Hello world!")
  RESULTIS 0
}

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