Open-source Designs
Three open-source keyer/keyset designs are available: The pickey a ps/2 device based on the PIC microcontroller, the spiffchorder a USB device based on the Atmel AVR family of microcontrollers, and the GKOS keypad driver for Linux as well as the Gkos library for the Atmel/Arduino open source board.
Plover is a free, open-source, cross-platform program intended to bring realtime stenographic technology not just to stenographers, but also to hobbyists using anything from professional Stenotype machines to low-cost NKRO gaming keyboards. It is available for Linux, Windows, and MacOSX.
Joy2chord is a Chorded Keyboard driver for Linux computers. With a configuration file, any joystick or gamepad can be turned into a chorded keyboard. This design philosophy was decided on to lower the cost of building devices, and in turn lower the entry barrier to becoming familiar with chorded keyboards. Macro keys, and multiple modes are also easily implemented with a user space driver.
Read more about this topic: Chorded Keyboard
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