xkeyboard-config

Keyboard configuration database for X Window System.

brewmacoslinux

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Keyboard configuration database for the X Window System

list all available keyboard layouts$ ls /usr/local/share/X11/xkb/symbols

view keyboard layout configuration files$ cat /usr/local/share/X11/xkb/rules/evdev.xml

find keyboard layouts for a specific language$ grep -r 'language name' /usr/local/share/X11/xkb/symbols

check available keyboard variants and options$ ls /usr/local/share/X11/xkb/rules/

display keyboard geometry definitions$ ls /usr/local/share/X11/xkb/geometry/