iButton Viewer is a Windows-only application that is easy to install and use.  It works with many iButtons including the DS1921 Thermochron iButtons.  It not only enables you to view output on your screen, but it lets you print it as well.  Unfortunately, iButton Viewer does not support all iButtons and it is no longer updated with new iButton releases.

Benefits
  Easier to navigate and use.
  Output can be seen on the screen, output to a file, or printed.
  Loads faster and responds faster than Java Based 1-Wire Viewer.
  Does not require JAVA Runtime
  Supports DS1921 iButtons, as well as many others.

Drawbacks
  Compiled application for Windows machines only.
  Does not support the newest iButton models (including, but not limited to DS1922 & DS1923).