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Ptable - Interactive periodic table with dynamic layouts showing names, electrons, oxidation, trend visualization, orbitals, isotopes, and compound search. Full descriptions from write-up sources.
Virtualmin - It includes numerous features not in the GPL version (like script installers, resellers, HTML editor, an improved UI, mobile access, spam and virus filtering).
Periodic-table.io - Interactive periodic table of the chemical elements in 38 languages - Includes properties, history, name origin, facts, applications, hazards, isotopes and more
Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
Kalzium - Kalzium (German for: Calcium) is a periodic table of the elements for KDE SC 4.
Jmol - Jmol is a free, open source molecule viewer for students, educators, and researchers in chemistry...