Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Microsoft keyboard layout creator - Edit the windows keyboard layout.
Typing Speed Test - A simple typing test to see how fast you can type
xmodmap - The xmodmap program is used to edit and display the keyboard modifier map and keymap table that are...
keyboardlayouteditor - Powerful, visual designer for designing and editing keyboard layouts.
KbdEdit - Keyboard layout editor, mapper/remapper.