ALGOL 60
ALGOL 60 is a high-level programming language known for its concise syntax and structured approach, used primarily for scientific and algorithmic computing.
Hello, world code example:
'BEGIN'
OUTSTRING(1,'('Hello world!')');
SYSACT(1,14,1)
'END'
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.
Repositories on GitHub: 98,033