Black Cat Systems' Atomic PC is a periodic table of the elements for Windows. In addition to the usual information found in such programs, The Atomic PC 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
also available, as well as electron shell information and alpha particle energies. In addition you can view the visible spectra, and get a table of wavelengths and relative amplitudes. A molecular weight calculator makes it easy to find the molecular weight of compounds. A shaded diagram showing the ranges of physical properties makes it easy to visualize relationships across the periodic table.