Forth

Forth is a stack-oriented programming language that combines a compiler with an interactive command shell, in which users interact through subroutines called words, drawing on concatenative, procedural and reflective paradigm elements. It was designed by Charles H. Moore, growing out of a personal programming system he had developed since 1968, first used by other programmers in 1970, and later standardized as ANS Forth in 1994. Forth is typeless, and its simplicity has allowed an entire development environment, including compiler, editor and user programs, to fit on 8-bit systems with very limited memory, which made it especially valuable during the microcomputer era of the 1980s. It found lasting niches in astronomical and space applications, embedded systems and boot loaders, powering spaceflight software such as the Philae lander and appearing in Open Firmware boot ROMs used by Apple, IBM, Sun and the OLPC project. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/