Atomic Mac
   An electronic version of the periodic table of elements with detailed physical and nuclear information.
   http://www.blackcatsystems.com/software/atomic.html

Atomic PC
   Downloadable Windows shareware containing abundant physical, chemical and nuclear information about the elements. Online registration available.
   http://www.engresource.com/software/atomic.html

BK Periodic Library
   Windows periodic table with element properties search and graphing. Free for personal use.
   http://www.orbit.org/perlib/

Celeste
   An interactive periodic table software product for Windows with graphing capabilities.
   http://www.chemlearn.com

ChemAP 2003
   Periodic Table of elements to compare elements, calculate molecular weights, property visualisation, unit conversion. [Windows]
   http://www.pcsoftland.com/education/chemistry/chemap-2003.htm

Dhaatu Periodic Table
   Free download for Windows.
   http://www.periodic.batcave.net

Electronic Periodic Table of the Elements
   Text-based periodic table for Unix. The source code, written in C, is available for download and use under the GNU GPL. It includes sound files that give element names and definitions out loud.
   http://www.toddmiller.com/epte/index.html

Kalzium
   Free periodic table program for the KDE desktop environment.
   http://edu.kde.org/kalzium/

Periodic Spiral of the Elements
   For Mac and PC, an alternative representation of the periodic table that aims to better place the lanthanoids, actinoids, and hydrogen. The program also includes extensive information about elements, their uses and their properties. Shockwave demo availab
   http://www.periodicspiral.com

Synergy Creations
   Developers of general educational software for the Macintosh platform, including Periodic Table software. Online purchasing available.
   http://www.synergycreations.com/