Here's how you can find and download tons of free Dashboard widgets for your Mac.
1. Go to the free Dashboard Widgets page on Apple's site.
2. Click on the category of the widget(s) you want to download.
3. Scroll down and click on the widget that interests you in the Widget field.
4. Information and a download link for your widget will be displayed in the Info field.
5. Click the download link to install the widget on your OS X Mountain Lion computer.
6. Click the More Info button if you want additional information before downloading the widget.
There are thousands of useful free Dashboard widgets available for your Mac. Here's a list of widget categories to whet your appetite:
Blogs & Forums
Calculate & Convert
Email & Messaging
Just For Fun
Movies & TV
Networking & Security
Radio & Podcasts