Make intonation visible with Praat
Channel: Sibylle Nalezinski
Date: 2013-02-25

This - free! -  tool draws a line, following your voice going up and down.

This is the website from which you can download the tool (a big Thank You to its capable and generous creators!): http://www.fon.hum.uva.nl/praat/
Maybe also interesting: I use a Zoom H2 for the audio recordings and record .wav for this type of exercise.
There are more comprehensive tutorials about praat on YouTube in case you would like to know more about the tool. I think this one gives useful information: 
https://www.youtube.com/watch?v=EDNhmBsOXcM&list=PL7A3811955E4BB45F