Here is a cool resource that you can use online. This music theory page by Ricci Adams has some great resources. Use your computer as a metronome, or even practice some chords. It’s worth a closer look! To visit click here: http://www.musictheory.net/tools
One suggestion for parents is to open the piano on the desktop on a regular basis. When your kids see it there they can use it as a reminder to practice – or they may even mess around with it online and keep their interest fresh.
For advanced students you can also get a 12 tone row matrix calculator. Pretty cool!