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KbdEdit - Keyboard layout editor, mapper/remapper.
Microsoft keyboard layout creator - Edit the windows keyboard layout.
Kanata - This is a cross-platform software keyboard remapper for Linux, macOS and Windows. A short summary of the features:
xmodmap - The xmodmap program is used to edit and display the keyboard modifier map and keymap table that are...
xremap - xremap is a key remapper for Linux. Unlike xmodmap, it supports app-specific remapping and Wayland.
Physcape - Physical escape key for macbooks with the Touch Bar.