A while ago I was gifted with a box full of tech bits and pieces which included an old Palm III (and its cradle). I have finally gotten around to getting it hooked up to the Linux box and it's now happily synching up with my calendar, contact list, to-do list, etc.
In the process of searching up info on getting it up and flying, I ran across an article explaining how to get Ubuntu Linux to install applications (and files) on it other than the default ones. So I started sniffing around for apps. Free ones, of course.
I found Fretboard almost immediately. It works!
This will display chords, scales and notes on a little fretboard graphic (check the screenshot) for a number of stringed instruments, including ukulele. It's intuitive and easy to use. It's free. It works on my trailing edge technology.
I'm a happy ukulele playing geek!