Here are a few example applications that use 9P, I have excluded Plan 9 and Inferno applications because on those systems all applications use 9P ;)
- Acme SAC - A programmer's editor, shell, and user interface for Windows, Linux and OS X.
- XCPU - Cluster management tool by the Los Alamos National Laboratory.
- Styx-on-a-Brick - Control Lego "Mindstorms" over 9P.
- WMII - X11 window manager.