(this article is just a stub, made from what I remeber from KDE4 beta 2 version)
Kalzium is a chemical database. The central feature is a mandeleïev table that can color elements folowing different rules such as
Kalzium also features a sidebar showing more info about the element you point onto the table. If you click on, this bring a window with detailed informations.
It also comes with a unit converter and greek letters table.
A glossary explains basics of some chemistry (this part you can help much without coding ) such as "what is a besher ?"
A useful tool in Kalzium will solve chemical equations. Feed it with a formula such as " aO2+bH2->cH20 " and it replies "1.O2 + 2H2 -> 2.H2O ". This is also able to calculate with charges (ions)
A beautiful feature of Kalzium is it's 3D molecule viewer. Load a molecule file and look at it's 3D representation in different modes (sticks, sticks and balls, --- and --- ).
An other tool which may be handy is a chemical file converter based on openbabel.