PILOT
From Just Solve the File Format Problem
PILOT (Programmed Inquiry, Learning, or Teaching) was a programming language designed for creating interactive tutorials for education. It was created in the 1960s and remained in use, in various microcomputer implementations, through the 1990s. Hobbyist implementations have been created and updated even later than that, extending well into the 21st century, although the maintainer of one of them, Eric S. Raymond, calls the language "as perverse and limiting as INTERCAL", and created it only because he prides himself on doing working implementations of obscure ancient programming languages.
