Table of the Nuclides (Popularity: )
http://atom.kaeri.re.kr/ Map of all known nuclides. Horizontal rows representing one element; with colored dots indicating the known isotopes of that element. A vertical column represents the nuclides with same neutron numbers.
Mathtrek Systems - EQS4WIN (Popularity: )
http://www.mathtrek.com/ PC-Windows software to assist in the calculation of equilibrium concentrations for five compounds and two elements (demonstration version.) Both Contains the JANAF thermochemical database. Also links to related tutorials.