A practical keymap that emulates standard QWERTY keyboard for Planck. Once you get comfortable with this keymap, you may fork and customize it for your own needs.

Online keyboard layout editor: http://goo.gl/mlLAFZ

Programming Instructions:

Enter into programming mode and run the following command.

$ sudo KEYMAP=ab make dfu

Notes

Simultaneous RAISE+LOWER enters CUSTOM layer. You may add your own macros and custom keys here.
RAISE and LOWER also acts as PgUp and PgDn when tapped.
[CapsLock] also acts as [Ctrl] key when you press and hold. It is convenient for GNU Emacs users.
Bracket keys are placed in the center of the keyboard for programmer's convenience.