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==Characteristics==
Features characterizing the Oberon language include:<ref>{{Cite web |last1=Wirth |first1=Niklaus |last2=Gutknecht |first2=Jürg |author-link=Jürg Gutknecht |date=1987–2021 |url=
* Case sensitive syntax with uppercase keywords
* Type-extension with type test
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===Active Oberon===
[[Active Oberon]] is yet another variant of Oberon, which adds objects (with object-centered access protection and local activity control), system-guarded assertions, preemptive priority scheduling and a changed syntax for methods (named ''[[Oberon-2#Type-bound procedures|type-bound procedures]]'' in Oberon vocabulary). Objects may be active, which means that they may be threads or processes. Further, Active Oberon has a way to implement operators (including overloading), an advanced syntax for using arrays (see [http://www.ethoberon.ethz.ch/native/compiler/x.index.html OberonX language extensions] {{Webarchive|url=https://web.archive.org/web/20160304043022/http://www.ethoberon.ethz.ch/native/compiler/x.index.html |date=4 March 2016 }} and Proceedings<ref>{{cite encyclopedia |last1=Friedrich |first1=Felix |last2=Gutknecht |first2=Jürg |author-link=Jürg Gutknecht |editor1-last=Lightfoot |editor1-first=David E. |editor2-last=Szyperski |editor2-first=Clemens |date=2006 |chapter=Array-Structured Object Types for Mathematical Programming |volume=4228 |publisher=Springer, Berlin Heidelberg |pages=195–210 |isbn=978-3-540-40927-4 |encyclopedia=Modular Programming Languages |doi=10.1007/11860990_13 |series=Lecture Notes in Computer Science|s2cid=34210781 }}</ref> of the 7th Joint Modular Languages Conference 2006 Oxford, UK), and knows about [[namespace]]s.<ref>{{cite web |url=http://www.ocp.inf.ethz.ch/wiki/Documentation/Language?action=download&upname=contexts.pdf |title=Proposal for Module Contexts |access-date=21 December 2015 |archive-date=22 December 2015 |archive-url=https://web.archive.org/web/20151222125420/http://www.ocp.inf.ethz.ch/wiki/Documentation/Language?action=download&upname=contexts.pdf |url-status=dead }}</ref> The operating system [[A2 (operating system)|A2]] (formerly ''Active Object System'' (AOS),<ref name="AOSthesis">{{Cite thesis |type=PhD |last=Muller |first=Pieter Johannes |date=2002 |title=The active object system design and multiprocessor implementation |url=http://e-collection.library.ethz.ch/eserv/eth:26082/eth-26082-02.pdf |publisher=Swiss Federal Institute of Technology, Zürich ([[ETH Zurich]])}}</ref> then ''Bluebottle''), especially the [[Kernel (operating system)|kernel]], synchronizes and coordinates different active objects.
ETHZ has released [[Active Oberon]] which supports active objects, and the operating systems based thereon (Active Object System (AOS), Bluebottle, A2), and environment (JDK, HTTP, FTP, etc.) for the language. As with many prior designs from ETHZ, versions of both are available for download on the Internet. As of 2003, supported [[central processing unit]]s (CPUs) include single and dual core [[x86]], and [[StrongARM]].
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* ''[https://modulaware.com/mwovms.htm Oberon System V4 for HP OpenVMS Alpha]'' with source code upward-compatible 64 bit addressing
* ''[https://modulaware.com/mwcvms.htm 64 bit Oberon-2 compiler]'' for OpenVMS Alpha
* ''[https://spivey.oriel.ox.ac.uk/corner/Oxford_Oberon-2_compiler Oxford Oberon-2 Compiler]'' and its [http://bitbucket.org/Spivey/obc-3/downloads/obcman.pdf User Manual]{{Dead link|date=July 2025 |bot=InternetArchiveBot |fix-attempted=yes }}
* ''[https://github.com/rochus-keller/Oberon Free Oberon-07 IDE]'' Free Oberon-07 IDE for Windows, Macintosh, and Linux with syntax colouring, semantic navigation and source code debugger
* ''[https://www.drdobbs.com/architecture-and-design/the-oberon-programming-language/184409405 Oberon article by Joseph Templ]'' in the January 1994 issue of Dr.Dobbs
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