This article is from the Ergonomics and Typing Injury FAQ, by Dan Wallach email@example.com with numerous contributions by others.
X window system software, via anonymous ftp
Standard in Microsoft Windows, Windows for Workgroups and
Windows NT Available as a free add-on for MS-DOS
To quote the Microsoft documentation
Dvorak keyboard layouts are based on designs created by August
Dvorak, a professor at the University of Washington during the 1930s
and 1940s. Dr. Dvorak studied the way people type standard English,
and determined the most common letter combinations. He then designed
new keyboard layouts to speed up typing and reduce fatigue. These
layouts, now called Dvorak or simplified keyboards, were initially
developed for two-handed typists. Following World War II, Dvorak
layouts were developed for typists who use the right or left hand
It is doubtful that switching to Dvorak will have a major impact on RSI,
but it may be helpful in preventing RSI. If you do switch, your typing
rate will go down a lot initially, which will help!
Microsoft Windows products support Dvorak as a standard keyboard layout -
look in the International setup in the Control panel.
MS-DOS supports this via the MS-DOS Supplemental Disk, available from
Microsoft, which includes standard and one-handed Dvorak layouts. These
layouts are available for Windows in Application Note GA0650, available
from Microsoft or from various online services as GA0650.ZIP.
In the US, training and keycap stickers for the Dvorak layout are
4516 NE 54th St.
Seattle, WA 98105-2933
Phone: 206-324-7219 (voice and fax)
If you are also looking at alternative keyboards, you might also like to
look at the Maltron layout, which is claimed to be more efficient than
Dvorak. See the alternative keyboard FAQ for supplier details.