The Igbo/Yorùbá keyboard layout helps you write Igbo, Yorùbá and English easily on your computer.
Download the Windows layout here.
After you install use Windows key + space bar to switch your keyboard layout to the Igbo/Yorùbá version.
Here's a manual explaining how to use the keyboard
Download the Mac layout here.
Here's a manual with instructions on how to set up and use it.