Databases

CRC Handbook of Chemistry and Physics
http://www.hbcpnetbase.com/
Data may be accessed after purchasing a personal or institutional subscription.

Data for Use in Stratospheric Modelling
http://jpldataeval.jpl.nasa.gov/
Very useful compilation of kinetic data by NASA's Jet Propulsion Laboratory.

NASA Atmospheric Chemistry Data and Resources
http://disc.sci.gsfc.nasa.gov/data/datapool/
This page contains information about the Upper Atmosphere Research Satellite, Total Ozone Mapping Spectrometer, Shuttle Solar Background Ultraviolet, and other atmospheric chemistry related data.

Thermodynamics of Enzyme-catalysed Reactions
http://xpdb.nist.gov/enzyme_thermodynamics/
Extensive compilation of equilibrium constants for enzyme-catalyzed reactions. This is NIST Standard Reference Database 74.

Radiation Chemistry Data Center at Notre Dame
http://www.rcdc.nd.edu/RCDC/RCDC.html
Very useful compilation of photochemical data.

Tutorials

The Arrhenius Equation
http://www.shodor.org/UNChem/advanced/kin/arrhenius.html
Calculator for the Arrhenius equation.

The Eyring Equation
http://www.chemie.uni-regensburg.de/Organische_Chemie/Didaktik/Keusch/eyr-e.htm
Good explanation of the Eyring Equation.

Software

Chemical Kinetics Simulator
http://www.almaden.ibm.com/st/computational_science/ck/?cks
Freeware developed by chemists at IBM's Almaden Research Center that provides an interactive method for the simulation of chemical reactions.