Chemistry Data Bases

Periodic Table
Theodore W. Gray’s Periodic Table
SDBS (Spectral Database for Organic Compounds)
PhotochemCAD (optical data via Oregon Medical Laser)
pKa Table
Name Reactions
IUPAC Nomenclature
Organic Syntheses
SciFinder (ACS)
Scopus (Elsevier)
Reaxys (Elsevier)

Chemistry Resource Collections

ChemSpider (search and share chemistry by RSC)
Not Voodoo
Organic Chemistry Portal
OrganicWorldwide.net
Organic Chemistry Resources (U Wisconsin)
WWW Chemistry Resources (UCLA)
WWW Chemistry Resources (Cambridge U)

Chemistry Programs

UCSF Chimera (visualization and analysis of molecular structures)
Cambridge Crystal Strucure Data Base (for Mercury CSD Crystal Structure Visualisation)
Isotope Distribution Calculator and Mass Spec Plotter

Publishers

ACS Journals
RSC Journals Finder
Wiley Online Library Chemistry
Springer Journals Chemistry
ScienceDirect (Elsevier)
Science
Nature
Nature Chemistry