The typing program was initially released in late 1987 by The Software Toolworks and has been published regularly ever since. The original version was written by Charles R Haymond, an independent computer programmer living in Berkeley California who later worked for the Department of Homeland Security. The first version written for MS-DOS was created by Norm Worthington, Walt Bilofsky, and Mike Duffy. Editions of Mavis Beacon are currently published by Encore Software (hybrid Mac and Windows) and Software MacKiev (macOS only) and are available throughout the retail sales world. An early version supported both QWERTY and the alternative Dvorak Simplified Keyboard layout. Later versions supported only QWERTY until the 2011 Ultimate Mac Edition from Software MacKiev which returned full Dvorak keyboard lessons to the product. Earlier versions were made for Apple II, Commodore 64, Atari 400/800 (version 1 only), Apple IIGS, Atari ST, Mac OS, Windows, Palm OS (version 16), and Amiga systems. The current Windows and Mac versions are published under the Brøderbund trademark by both Encore and Software MacKiev.
Description from Wikipidia