I have developed a freeware, entitled ChemToolBox, which gathers numerous data very useful for chemists (students, lab workers, senior scientists, etc.). It is available in english and french.
Basically, it can be a precious help in various fields such as organic chemistry (properties of solvents, miscibility and polarity, cooling mixtures), solution chemistry (acid/base and RedOx couples, colored indicators, complexes, salts, fluorochroms), spectroscopy (1H and 13C NMR) or polymer chemistry), biochemistry (amino acids, nitrogen bases, carbohydrates, fatty acids, SDS-PAGE), etc.
ChemToolBox also has a full periodic table of elements (with the picture of all elements), a units conversion and calculations module, as well as numerous scientific constants with SI units and derivatives.
All these data can be exported in HTML.
It is already available on french downloading sites and little by little on US counterparts.
Here is the website of ChemToolBox: http://chemtoolbox.free.fr
(english or french)
PS: obviously, there is no spyware, virus, malware or stuff like that.