I found myself firing up a calculator every time I needed to base-convert a number from/to hex or octal. So I wrote a very simple HTML-page that I added to my dashboard that does just this.

If you want to turn this iframe into a widget:

  1. make a directory with a temporary name
  2. save the iframe as base-convertor.html
  3. add this plist-file
  4. add these two images
  5. rename the directory to end in .wdgt, which will convert the directory to a package.