OS/Modula-2

Modula-2 is a structured, procedural programming language developed between 1977 and 1985/8 by Niklaus Wirth at ETH Zurich. It was created as the language

Modula-3 is a programming language conceived as a successor to an upgraded version of Modula-2 known as Modula-2+. While it has been influential in research

Modula-2+ is a programming language descended from the Modula-2 language. It was developed at DEC Systems Research Center (SRC) and Acorn Computers Ltd

ORCA/Modula-2 is a Modula-2 compiler written in the Modula-2 programming language for the Apple IIGS computer. It was developed by Peter Easdown during

object-oriented operating system built from modules of Modula-2. Its design influenced the design of the OS Excelsior, developed for the Soviet Kronos workstation