Editing 9P (protocol) (section)

== Server applications ==
Many of Plan 9's applications take the form of 9P file servers. Examples include:
* [[acme (text editor)|acme]]: a text editor/development environment
* [[rio (windowing system)|rio]]: the Plan 9 windowing system
* [[plumber (Plan 9)|plumber]]: interprocess communication
* ftpfs: an [[File Transfer Protocol|FTP]] client that presents the files and directories on a remote FTP server in the local [[Plan 9 from Bell Labs#Union directories and namespaces|namespace]]
* wikifs: a [[wiki]] editing tool that presents a remote wiki as files in the local namespace
* webfs: a file server that retrieves data from [[URL]]s and presents the contents and details of responses as files in the local namespace

Outside of Plan 9, the 9P protocol is still used when a lightweight remote file system is required:
* [[NixOS]]: a Linux distribution that uses the [[Nix package manager]]. NixOS can rebuild itself inside a [[virtual machine]], where the client uses 9P to mount the package store directory of the host.
* [[GNU Guix]]: a [[package manager]] that can instantiate and manage [[Unix-like]] operating systems. It can instantiate a system inside a [[virtual machine]] in the same manner that [[NixOS]] does
* [[Windows Subsystem for Linux]] (WSL): since Windows 10 version 1903, the subsystem implements 9P as a server and the host Windows operating system acts as a client.<ref>{{Cite web|url=https://devblogs.microsoft.com/commandline/whats-new-for-wsl-in-windows-10-version-1903/|title=What's new for WSL in Windows 10 version 1903?|date=February 16, 2019|website=Windows Command Line Tools For Developers}}</ref>
* [[Chrome_OS#Linux_apps|Crostini]]: a custom 9P server is used to provide access to files outside of a Linux VM <ref>{{Cite web|url=https://chromium.googlesource.com/chromiumos/docs/+/master/containers_and_vms.md#Overview|work=Chromium OS Docs|title=Running Custom Containers Under Chrome OS|access-date=2019-03-28}}</ref>
* [[QEMU]]: the VirtFS device allows for filesystem sharing over 9P, which is accelerated with kernel drivers and shared memory <ref>{{Cite journal|last1=Jujjuri|first1=Venkateswararao|last2=Van Hensbergen|first2=Eric|last3=Liguori|first3=Anthony|last4=Pulavarty|first4=Badari|date=July 13–16, 2010|title=VirtFS—A virtualization aware File System pass-through|url=https://www.kernel.org/doc/ols/2010/ols2010-pages-109-120.pdf|journal=Linux Symposium}}</ref><ref>{{Cite web|url=https://wiki.qemu.org/Documentation/9psetup|title=Documentation/9psetup|website=QEMU Docs|access-date=2019-03-28}}</ref>
* [https://github.com/chaos/diod DIOD]: Distributed I/O Daemon{{dash}}a 9P file server