gVisor is an application kernel, written in Go, that implements a substantial portion of the Linux system call interface. It provides an additional layer of isolation between running applications and the host operating system.
Found on https://marc.info/?l=9fans&m=165401374021100&w=2

Plan9 command to insert filters for read and write access to a file. Found via https://marc.info/?l=9fans&m=164529121414777&w=2

Wiki about the 9front branch of the Plan 9 operating system.

Instructions for installing 9front on an SDF VPS. Found on https://9p.sdf.org/

Instructions for the installation of v8 unix on SimH.

The articles sound interesting, particularly those about Plan 9.
So does TexiWeb Jr., a super simple literate programming system built
on top of Texinfo and implemented in awk https://github.com/arnoldrobbins/texiwebjr
which is mentioned in
AWK As A Major Systems Programming Language — Revisited
http://www.skeeve.com/awk-sys-prog.html

This suite of open source tools is the software development platform you've been waiting for. We've taken the wisdom of the most successful open-source communities and turned it into a platform of efficient engineering tools.

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All features work without JavaScript
The fastest, most lightweight software forge
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Sourcehut is currently (2020-09) available as a public alpha.
Note that it includes a Plan9(front) continuous integration service
https://sourcehut.org/blog/2020-05-11-sourcehut-plus-plan-9/

Recommended by Brett Gilio
https://brettgilio.com/posts/2020-10-01-why-self-host.html

Boot an UEFI machine over the network using the Plan 9 protocol.

Interim is an attempt to implement an operating system using ideas from the Lisp machines and Plan 9.
https://github.com/mntmn/interim
The blog has other interesting articles on (Emacs) Lisp, Scheme, git...

This post is a survey of technical and community issues connected to Plan 9 root file servers. The author is not a member of any Plan 9 tribe save Grid. Opinions are entirely my own and a lot of unsourced claims will be made based on my years of participation and observation of the Plan 9 community.