Ptable - Interactive periodic table with dynamic layouts showing names, electrons, oxidation, trend visualization, orbitals, isotopes, and compound search. Full descriptions from write-up sources.
Atomic - Periodic Table - Bring a Periodic Table with you anywhere you go
Periodic-table.io - Interactive periodic table of the chemical elements in 38 languages - Includes properties, history, name origin, facts, applications, hazards, isotopes and more
Kalzium - Kalzium (German for: Calcium) is a periodic table of the elements for KDE SC 4.
GPeriodic - GPeriodic is a periodic table application for Linux.
WebElements - Explore the chemical elements through this periodic table