Some titles may require you to register before accessing the articles. The information provided also includes MSDS, IR spectra and suppliers details. LiqCryst Online offers free access to its demo-set database of structures and the LC Registration numbers of more than 70000 compounds. Searching is by structures drawing, compound names, registry number, etc. The molecular mass, line notation and structure of the all compounds are displayed even when they are not in the demo-set.
Registration is free.
WebElements for the periodic table on the Web. WebMolecules is a site to view the molecular graphics in 3D with its common attributes. Searching is by category or formula. These pages is heavy with images and take a while to load. It is also searchable.