The current Opera amazes me. Though I have tried some of the widgets before, the speed of the modern widgets is almost unbelievable. According to the Opera site, it uses hardware acceleration. How it does it is magical, but I am blown away by the following science widgets (in Ubuntu, they are accessible in Applications/Other menu.
Spirograph
Widtex
Scientific Calculator
Math Workpad
There are a host of other applications, and you will not be sorry if you install Opera in your Windows, Linux or Apple/Mac computers.
The widgets are available from http://widgets.opera.com/.
The widgets can run even if Opera is not installed. I just wish, Nokia can install these widgets in the C3 phone.
Amazing!