PL/I

Paradigms	structured programming, procedural programming, concurrent computing, imperative programming
Typing discipline	strong typing
First appeared	1964
Designed by	IBM
Developer	IBM
Type	procedural programming language, programming language
Influenced by	Fortran, ALGOL, COBOL
Website	ibm.com

Sources: Wikidata (CC0) · Wikidata Q223433

Programming languages · 6

Language	Paradigms	First appeared	Developer
ALTRAN	—	1965	Bell Telephone Laboratories
C	multi-paradigm programming, imperative programming, structured programming, procedural programming	1972	Dennis M. Ritchie, Bell Labs, American National Standards Institute, International Organization for Standardization, Ken Thompson
PL/C	procedural programming, imperative programming, structured programming	1973	Cornell University
PL/M	procedural programming, structured programming	1973	Gary Kildall
REXX	procedural programming, structured programming	1979	IBM, Mike Cowlishaw
XPL	structured programming, procedural programming	1967	—

Operating systems · 2

Operating system	Developer	First release	License
Cosmos (Olivetti)	Olivetti	—	—
Multics	Bell Labs, Massachusetts Institute of Technology, General Electric	1969	MIT License