Videotron_monitor_mac is a project mainly written in JavaScript, it's free.
Videotron Internet Usage Monitor widget for Mac
Quite simply, this is a Mac Dashboard widget that allows Videotron.com customers to monitor their monthly bandwidth quota.
The widget will display the following:
Every 6 hours, the extension sends an HTTP request to the Videotron Public API.
This API has been developed by Videotron to provide to third-party developers the data necessary to display bandwidth usage for Videotron customers.
Download the widget from my blog and simply double-click it to install.
Then go in the options (click the round i icon in the lower-right corder), and enter your Videotron User Key.
Don't know your Videotron User Key? You can find it in your Videotron Customer Center, in the User Key tab of the Your Profile page.