Sorry but this page is woefully and embarrassingly out of date.
Some of the latest additions and bug fixes are listed here.

The latest version of the packages are...
******  Fieldsolver FXY version 3.3
******  Fieldsolver FRZ version 3.26
******  Fieldsolver F3D version 3.75
******  Envelope solver ENV version 3.22
******  Envelope solver CIR version 3.9
******  Envelope solver HER version 3.11
******  Particle package WXY version 3.33
******  Particle package WRZ version 3.9
******  Particle package W3D version 3.113
******  Main package TOP version 3.92

June 10, 2003 - Many changes and improvements - see edit logs. A GUI is in development.
December, 2000 Added new plotting capabilities. See some examples.
November 15, 2000 - Many changes have been made. Here are the major ones.
February 2, 2000 - Numerous minor updates were made to the main source code and the python scripts
October 7, 1999 - Numerous minor updates were made to the main source code and the python scripts
July 21, 1999 - Added several new python scripts.
June 17, 1999 - More options for particle loading added.
June 16, 1999 - Envelope centroid calculation added.
June 1, 1999 - Added generic routine fieldsol.
May 4, 1999 - Added dipobx and dipoey fields.