Update: 11/11/19 Skype has sunsetted it's click-to-call feature, so this feature is only available via Google Voice.
NationBuilder makes it easy to create a computer-based phone canvass (here's a how-to video on using the voter file to cut your lists). And if you want to set up an inexpensive click-to-call phone banking operation, you can use a Chrome extension and Google Voice.
Download the Google Chrome extension for Google Voice.
