The latest language in the GNU Compiler Collection: Algol-68
Briefly

"When Richard Stallman announced GCC in 1987, its initials stood for the 'GNU C Compiler'. By December that year, version 1.15.3 included g++, support for C++. Today, GCC stands for the GNU Compiler Collection, broadening its capabilities with languages like Ada, D, Go, and more."
"ALGOL-68 is a seminal early programming language, but it's not the most influential version; that honor goes to ALGOL-60, which is credited for its enduring impact on the structure of modern programming languages. Most languages today derive design elements from the innovations of ALGOL-60."
Read at Theregister
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