1. Introduction

   This	document catalogs currently available implementations of X.500,
   including commercial	products and openly available offerings.  For
   the purposes	of this	survey,	we classify X.500 products as,

   DSA
	A DSA is an OSI	application process that provides the Directory
	functionality,

   DUA
	A DUA is an OSI	application process that represents a user in
	accessing the Directory	and uses the DAP to communicate	with a
	DSA, and

   DUA Interface
	A DUA Interface	is an application process that represents a user
	in accessing the Directory using either	DAP but	supporting only
	a subset of the	DAP functionality or a protocol	different from
	DAP to communicate with	a DSA or DUA.

   Section 2 of	this document contains a listing of implementations
   cross referenced by keyword.	 This list should aid in identifying
   implementations that	meet your criteria.

   To compile this catalog, the	IDS Working Group solicited input from
   the X.500 community by surveying several Internet mailing lists,
   including:  iso@nic.ddn.mil,	isode@nic.ddn.mil, osi-ds@cs.ucl.ac.uk,
   and ietf-ids@umich.edu. We also contacted many people by telephone
   and sent the	template to several individuals	and mailed a floppy disk
   containing the survey template to a person who did not have Internet
   access.

   Readers are encouraged to submit comments regarding both the	form and
   content  of	this  memo.  New submissions are welcome.  Please direct
   input to  the  Integrated  Directory	 Services  (IDS)  Working  Group
   (ietf-ids@umich.edu)	 or  to	 the editors.  IDS will	produce	new ver-
   sions of this document when a sufficient number of changes have  been
   received.  This will	be determined by the IDS chairpersons.

1.1. Purpose

   The Internet	has experienced	a steady growth	in X.500 piloting
   activities.	This document hopes to provide an easily accessible
   source of information on X.500 implementations for those who	wish to
   consider X.500 technology for deploying a Directory service.

1.2. Scope

   This	document contains descriptions of both free and	commercial X.500
   implementations.  It	does not provide instructions on how to	install,
   run,	or manage these	implementations.  The descriptions and indices
   are provided	to make	the readers aware of available options and thus
   enable more informed	choices.

1.3. Disclaimer

   Implementation descriptions were written by implementors and	vendors,
   and not by the editors. We worked with the description authors to
   ensure uniformity and readability, but can not guarantee the	accuracy
   or completeness of the descriptions,	or the stability of the
   implementations.

1.4. Overview

   Section 1 contains introductory information.

   Section 2 contains a	list of	keywords, their	definitions, and a cross
   reference of	the X.500 implementations by these keywords.

   Section 3 contains the X.500	implementation descriptions.

   Section 4 has a list	of references.

   Section 6 lists the editors'	addresses.

1.5. Acknowledgments

   The creation	of this	catalog	would not have been possible without the
   efforts of the description authors and the members of the IDS Working
   Group.  Our special thanks to the editors of	RFC 1292(-> 1632(-> 2116fyi11)), Ruth Lang and
   Russ	Wright who helped us get started and made key suggestions that
   enabled us to learn from their experience. We also acknowledge and
   appreciate the efforts of Ken Rossen	in obtaining six descriptions.