Editing POSIX (section)

===Formerly POSIX-certified===
Some versions of the following operating systems had been certified to conform to one or more of the various POSIX standards. This means that they passed the automated conformance tests. The certification has expired and some of the operating systems have been discontinued.<ref name="renew_certification" />
<!-- Please don't add additional operating systems without also citing a source for the information. -->
{{div col|colwidth=15em}}
*[[EulerOS]] (exp. 2022)<ref>{{cite web |url=https://www.opengroup.org/openbrand/register/huawei.htm|title=Huawei Technology Co., Ltd|publisher=The Open Group|access-date=26 May 2017}}</ref>
*[[Inspur K-UX]] (exp. 2019)<ref>{{cite web|url=https://www.opengroup.org/openbrand/register/inspur.htm|title=Inspur Co., Ltd |publisher=The Open Group|access-date=26 May 2017}}</ref>
*[[IRIX]] (defunct 2006)<ref>{{cite web |url=https://www.opengroup.org/openbrand/register/sgi.htm|title=Silicon Graphics, Inc. |publisher=The Open Group|access-date=26 January 2014}}</ref>
*[[OS/390]] (defunct 2004)<ref>{{cite web|archive-url=https://web.archive.org/web/20030802103246/http://www.opengroup.org/openbrand/register/|url=http://www.opengroup.org/openbrand/register/|title=The Open Brand - Register of Certified Products|date=23 July 2003|archive-date=2 August 2003|access-date=23 January 2022|website=Open Group}}</ref>
*[[QNX|QNX Neutrino]]<ref>{{cite press release|url=http://www.qnx.com/news/pr_2862_1.html|title=QNX Achieves New POSIX Certification|date=8 April 2008|access-date=16 January 2016 | publisher=QNX}}</ref>
*[[Solaris (operating system)|Solaris]] (exp. 2019)<ref>{{cite web|url=https://www.opengroup.org/openbrand/register/sun.htm|title=Oracle Corporation|publisher=The Open Group|access-date=26 January 2014|archive-url=https://web.archive.org/web/20170712134003/https://www.opengroup.org/openbrand/register/sun.htm|archive-date=12 July 2017}}</ref>
*[[Tru64 UNIX|Tru64]] (defunct 2010)<ref>{{cite web|url=https://www.opengroup.org/openbrand/register/hp.htm|title=Hewlett-Packard  |publisher=The Open Group|access-date=26 January 2014|archive-url=https://web.archive.org/web/20140709114759/https://www.opengroup.org/openbrand/register/hp.htm|archive-date=9 July 2014}}</ref>
*[[LiteOS]] (defunct 2020)<ref>{{cite web |title=Huawei LiteOS / LiteOS |url=https://gitee.com/LiteOS/LiteOS |website=Gitee |publisher=Huawei |access-date=23 May 2024}}</ref>
{{div col end}}