Editing ALGOL 68 (section)

===True ALGOL 68s specification and implementation timeline===
{|class="wikitable sortable"
|- style="background:#ccc;"
! Name || Year || Purpose || State || Description || Target CPU || Licensing || Implementation language
|-
|[[Generalized ALGOL]] || 1962 || Scientific || {{flag|NLD}} || ALGOL for generalised grammars ||  ||  ||
|-
|[[ALGOL Y]]<sup>Y</sup> || 1966 || Draft proposal || Intl || First version of Algol 68 || Specification || [[Association for Computing Machinery|ACM]] ||
|-
|ALGOL 68<sup>DR</sup> || 1968 || Draft proposal || Intl || IFIP WG 2.1 Draft Report || Specification – March || ACM ||
|-
|ALGOL 68<sup>[[#The language of the unrevised report|r0]]</sup> || 1968 || Standard || Intl || IFIP WG 2.1 Final Report || Specification – August || ACM ||
|-
|[[ALGOL 68-R]]<sup>R</sup> || 1970 || Military || {{flag|UK}} ||  || [[ICT 1900 series|ICL 1900]] ||  || ALGOL 60
|-
|[[EPOS ALGOL]]<sup>E</sup> || 1971 || Scientific ||  ||  ||  ||  ||
|-
|[[ALGOL 68RS]]<sup>RS</sup> || 1972 || Military || {{flag|UK}} || Portable compiler system || ICL 2900/Series 39, Multics, VMS & {{nowrap|C generator (1993)}} || [[Crown Copyright]] || ALGOL 68RS
|-
|Algol 68 with areas || 1972 || Experimental & other || {{flag|UK}} || Addition of areas to Algol 68 ||  ||  ||
|-
|Mini ALGOL 68 || 1973 || Research || {{flag|NLD}} || Interpreter for ALGOL 68 subset<ref>{{cite web |url=http://oai.cwi.nl/oai/asset/9494/9494A.pdf |title=An interpreter for simple Algol 68 Programs |archive-url=https://web.archive.org/web/20110718172314/http://oai.cwi.nl/oai/asset/9494/9494A.pdf |archive-date=2011-07-18 |url-status=dead}}</ref> || Portable interpreter || [[Mathematisch Centrum]] || [[ALGOL 60]]
|-
|[[OREGANO]] || 1973 || Research || {{flag|US}} || "The importance of implementation models." ||  || [[UCLA]] ||
|-
|[[ALGOL 68C]]<sup>C</sup> || 1975 || Scientific || {{flag|UK}} || Cambridge Algol 68 || [[International Computers Limited|ICL]], IBM 360, PDP-10 & Unix, [[Telefunken]], TESLA 200,<ref>{{cite journal |url=https://archive.computerhistory.org/resources/text/algol/algol_bulletin/A42/P21.HTM |title=AB42.2.1 Implementation on TESLA 200 |first=J. |last=Nadrchal |journal=Algol Bulletin |issue=42 |date=May 1978}}</ref> [[Z80]] (1980)<ref>{{cite journal|url=http://www.80bus.co.uk/publications/magazines/LSG3.pdf |title=ALGOL68C on the Z80 |first=Raymond |last=Anderson |pages=52-57 |journal=Liverpool Software Gazette |edition=Third |date=March 1980 |access-date=2010-03-20 |url-status=dead |archive-url=https://web.archive.org/web/20100415194813/http://www.80bus.co.uk/publications/magazines/LSG3.pdf |archive-date=2010-04-15}}</ref> || Cambridge || ALGOL 68C
|-
|'''ALGOL 68 Revised Report'''<sup>[[#Revisions|r1]]</sup> || 1975 || Standard || Intl || IFIP WG 2.1 Revised Report || Specification || ACM ||
|-
|[[Algol H]]<sup>H</sup> || 1975 || Experimental & other || {{flag|UK}} || Proposed extensions to the mode system of Algol 68 || Specification ||  || [[ALGOL W]]
|-
|[[Odra (computer)|Odra]] Algol 68 || 1976 || practical uses || {{flag|USSR}}/{{flag|Poland}} ||  || Odra 1204/IL || [[Copyright law of the Soviet Union|Soviet]] || [[ALGOL 60]]
|-
|Oklahoma ALGOL 68 || 1976 || programming instruction || {{flag|USA}} || [[Oklahoma State University]] implementation<ref>{{cite conference |last1=Hedrick |first1=G.E. |last2=Robertson |first2=Alan |title=The Oklahoma State ALGOL 68 Subset Compiler |conference=1975 International Conference on ALGOL 68 |location=Stillwater, OK |date=June 10–12, 1975}}</ref><ref>{{cite journal |last=Hedrick |first=G.E. |doi=10.1145/382175.803425 |title=ALGOL68 instruction at Oklahoma State University |journal=ACM SIGCSE Bulletin – Special Issue Eighth Technical Symposium on Computer Science Education |volume=9 |issue=3 |date=August 1977 |pages=16–20 |publisher=ACM |location=New York, NY, USA}}</ref> || [[IBM 1130]] and [[System/370]]/158 || {{Unknown|Unknown}} || ANSI [[Fortran 66]].
|-
|Berlin ALGOL 68 || 1977 || Research || {{flag|DE}} || Portable compiler for System/370, Siemens S4004, and [[PDP-11]]<ref>{{cite journal |doi=10.1145/872738.807149 |title=The Berlin ALGOL 68 implementation |journal=ACM SIGPLAN Notices |volume=12 |issue=6 |pages=102-108 |first1=Wilfried |last1=Koch |first2=Christoph |last2=Oeters}}</ref><ref>{{cite conference |doi=10.1007/3-540-07410-4_665 |title=An abstract ALGOL 68 machine and its application in a machine independent compiler |conference=GI — 5. Jahrestagung |series=Lecture Notes in Computer Science |volume=34 |date=1975 |pages=642-653 |first1=W. |last1=Koch |first2=C. |last2=Oeters |editor-last=Mülbacher |editor-first=J. |publisher=Springer |location=Berlin, Heidelberg}}</ref> || Machine-independent compiler || [[Technische Universität Berlin]] || [[Compiler Description Language|CDL 2]]
|-
|[[FLACC]]<sup>F</sup> || 1977 || Multi-purpose || {{flag|CAN}} || Revised Report complete implementation with debug features || System/370 || lease, Chion Corporation || Assembler
|-
|[[ALGOL 68-RT]]<sup>RT</sup> || 1979 || Scientific || {{flag|UK}} || Parallel ALGOL 68-R ||  ||  ||
|-
|[[RS Algol]]<sup>rs</sup> || 1979 || Scientific || {{flag|UK}} ||  ||  ||  ||
|-
|ALGOL 68+ || 1980 || Scientific || {{flag|NLD}} || Proposed superlanguage of ALGOL 68<ref>{{cite web |url=http://hopl.murdoch.edu.au/showlanguage2.prx?exp%3D4351 |title=The Encyclopedia of Computer Languages |access-date=2010-03-20 |url-status=dead |archive-url=https://web.archive.org/web/20110310110439/http://hopl.murdoch.edu.au/showlanguage2.prx?exp=4351 |archive-date=2011-03-10}}</ref> ||  ||  ||
|-
|[[M-220]] ALGOL 68 ||  ||  || {{flag|USSR}} ||  || M-220 || [[Copyright law of the Soviet Union|Soviet]] || EPSILON
|-
|[[Leningrad ALGOL 68]]<sup>L</sup> || 1980 || Telecommunications || {{flag|USSR}} || Full language + modules || IBM, DEC, CAMCOH, PS 1001 & PC || [[Copyright law of the Soviet Union|Soviet]] ||
|-
|[[Interactive ALGOL 68]]<sup>I</sup> || 1983 ||  || {{flag|UK}} || [[Incremental compilation]] || PC || Noncommercial [[shareware]] |||
|-
|[[ALGOL 68S]]<sup>S</sup> || 1985 || Scientific || Intl || Sun version of ALGOL 68 || [[Sun-3]], Sun [[SPARC]] (under [[SunOS]] 4.1 & [[Solaris (operating system)|Solaris]] 2), [[Atari]] ST (under [[Atari ST|GEMDOS]]), [[Acorn Archimedes]] (under [[RISC OS]]), [[VAX-11]] under [[Ultrix-32]] ||  ||
|-
| Algol68toC<ref>[[SourceForge:projects/algol68/files/|Open source Algol 68 implementations – Browse Files at]]. Sourceforge.net. Retrieved on 2013-07-21.</ref> (ctrans) || 1985 || Electronics || {{flag|UK}} || ctrans from [[ELLA (programming language)|ELLA]] [[ALGOL 68RS]] || Portable C&nbsp;generator&nbsp; 
| {{Open source|[[Open-source software]]}} (1995) || ALGOL 68RS
|-
|MK2 [[Interactive ALGOL 68]] || 1992 ||  || {{flag|UK}} || [[Incremental compilation]] || PC || Noncommercial shareware<ref>{{cite web |url=http://www.nunan.fsnet.co.uk/algol68/a68mk2.zip |title=ZIP archive of MK2.1 release |archive-url=https://web.archive.org/web/20060829235643/http://www.nunan.fsnet.co.uk/algol68/a68mk2.zip |archive-date=2006-08-29 |url-status=dead}}</ref>||
|-
|Algol 68 Genie<sup>G</sup> || 2001 || Full language || {{flag|NLD}} || Includes standard collateral clause || Portable interpreter 
| {{Open source|[[GPL]]}}
| [[C (programming language)|C]]
|-
|Algol 68 Genie version 2.0.0 || 2010 || Full language || {{flag|NLD}} ||  || Portable interpreter; optional compilation of selected units
| {{Open source|[[GPL]]}}
| [[C (programming language)|C]]
|-
|[[GNU Compiler Collection|GCC]] (ga68) || 2025 || Full language || {{flag|ESP}} || GCC Front-End || Portable compiler
| {{Open source|[[GPL]]}}
| [[C (programming language)|C]]
|}

The [[S3 (programming language)|S3 language]] that was used to write the [[ICL VME]] operating system and much other system software on the [[ICL 2900 Series]] was a direct derivative of Algol 68. However, it omitted many of the more complex features, and replaced the basic modes with a set of data types that mapped directly to the 2900 Series hardware architecture.