If you're not into javascript and git, you will probably want to use the above link to download a recent version from the Chrome Web Store.
This is a Gmail widget published on the Chrome Web Store.
GNU General Public License version 3
Everyone who is willing to agree to allow me to publish submitted code under the GPL v3 or future licenses. This ensures both of us (and anyone else) can use it so long as it always remains under the same license.
I'm not a lawyer, so take this with a grain of salt:
If your widgets are built from this widget, then it must be GPL v3 licensed. If you make a widget from the (shell widget)[https://github.com/michaelhart/NTP-Widget-Shell] or your own custom code, then it doesn't need to be GPL v3 licensed.
For more information, please see the GPL FAQ.