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KbdEdit - Keyboard layout editor, mapper/remapper.
Kanata - This is a cross-platform software keyboard remapper for Linux, macOS and Windows. A short summary of the features:
Microsoft keyboard layout creator - Edit the windows keyboard layout.
xremap - xremap is a key remapper for Linux. Unlike xmodmap, it supports app-specific remapping and Wayland.
xmodmap - The xmodmap program is used to edit and display the keyboard modifier map and keymap table that are...
keyd - Linux lacks a good key remapping solution. In order to achieve satisfactory results a medley of tools need to be employed (e.g xcape, xmodmap) with the end result often being tethered to a specified environment (X11).