Atomic Mac
Periodic table of the elements software. In addition to the usual information found in such programs, it also contains a wealth of nuclear information on each isotope, including half life, decay mode, and daughter products. X-ray data (fluorescence and binding energies) is included, as well as... Clicking on one takes you to detailed data for that isotope, such as half life, decay mode, alpha/beta/gamma energies, and daughter products. ... A molecular weight calculator makes it easy to find the molecular weight of compounds.
http://www.blackcatsystems.com/download/AtomicMacOSX.zip - 3Mb - Download - Screenshot

Atomic PC
Periodic table of the elements software. In addition to the usual information found in such programs, it also contains a wealth of nuclear information on each isotope, including half life, decay mode, and daughter products. X-ray data (fluorescence and binding energies) is included, as well as... Clicking on one takes you to detailed data for that isotope, such as half life, decay mode, alpha/beta/gamma energies, and daughter products. ... A molecular weight calculator makes it easy to find the molecular weight of compounds.
http://www.blackcatsystems.com/pub/AtomicPC.zip - 3Mb - Download - Screenshot

CHEMIX School
CHEMIX School is an educational tool for learning chemistry. It is geared toward college-level chemistry, but is also appropriate for high-school students, chemists, and teachers. It is equipped with a periodic table containing physical properties for all stable isotopes including more than 2500... Chemistry lessons and problems are included. ... Both english and norwegian versions are available. ... It is also equipped with a molecular 3-D viewer, calculator, curve fit, function plot, data manipulation, derivatives, definite integrals, ternary plot, conversion table, solubility chart,...
http://www.standnes.no/chemix/english/cmxsed30.exe - 1Mb - Download - Screenshot

PL Table
This Periodic Table is an excellent tool for both students and serious researchers. It has over 20 types of data on each element and all known isotopes in customizable, user-expandable tables. All sixteen numeric data types (plus any user-added data) can be corelated in particle or line graphs.
http://www.chemtable.com/files/PLTable.zip - 1Mb - Download - Screenshot

Atomic Battle Dragons
Mount your dragon and take to the skies and joust mythical enemies! Atomic Battle Dragons is an action and adventure game where you fly a dragon and battle several mythical enemies. You play as a dragon knight and uncover a story rooted in medieval mythology. ... "Isotope 244 has done a fantastic job graphically in the past with their games, but that won't prepare you for the visual masterpiece that they are creating in this new game. ... The game supports several input methods, and has many user settings, so you can customize the game to play and look the way you want.
http://isotope244.swmirror.com/Atomic-Battle-Dragons-Demo.exe - 8Mb - Download - Screenshot