There are 2 repositories under xkb-keyboard-layout topic.
"DreymaR's Big Bag of Keyboard Tricks" for *nix with XKB
Drivers de teclado Dvorak em língua portuguesa
International US QWERTY keyboard layout with AltGr (Right Alt) dead keys (Windows/Linux)
A sensible version of the US-International keyboard layout with AltGr dead keys for Windows (KLC, AHK, or PKL), Mac (Keylayout), and Linux (XKB).
the colemak keyboard layout adapted to the swedish language
A single layout. Both for prgramming, and for civil life.
German Dvorak done properly - a replacement for Dvorak Type II
Linux XKB files for custom ANSI and Colemak-DH ANSI layouts
A daemon to auto switch keyboard layout on switching the focused i3 windows and workspaces.
Layout de teclado Dvorak em português
Two keyboard layouts for Myanmar SignWriting Fingerspelling
Some brazilian variants of my favorite keyboard layouts
Keyboard layout mod functions to permit split and at-rest hand positions by virtual means
A collection of custom keyboard layouts
Dvorak keyboard layout for use with Western European languages
Keyboard layout for Linux to relocate navigation and number keys closer to the Home Row, replicating vim-like keys on any non-vim text fields/editors, enhancing typing experience.
Testing repository for UltimateKEYS
XKB Extended belarusian typographical layouts
Kabyle keyboard for Linux and Wondows
Lakota language input modes for Emacs and X11
Legacy version of UltimateKEYS
An implementation of the XKB US International keyboard layout for Windows
Custom keymap for xkb, letting users of swedish keyboards enjoy more easily accessible programming characters through Caps_Lock-key.
US Qwerty klávesnice s českými znaky bez potřeby přepínání layoutů.
A custom Latin keyboard layout including Greek symbols (wσ) for a scientific programmer.
Set of PC-keyboard (ISO-105) layouts for modern Slavic languages
Myanmar Linux All in One Collector
Keyboard mappings for Semitic transliteration