Computational Chemistry Comparison and Benchmark Database Compares experimental properties of small gas phase molecules with properties computed using a variety of ab initio methods. http://srdata.nist.gov/cccbdb/
Linear Scaling Electronic Structure Methods Lecture notes from a 2002 conference sponsored by the Institute for Pure and Applied Mathematics at the University of California, Los Angeles. http://www.ipam.ucla.edu/programs/es2002/
Relativistic Theory of Atoms and Molecules Searchable database of journal articles focusing largely (but not exclusively) on relativistic ab initio quantum chemical calculations. http://www.csc.fi/rtam/
Sicklist Database List of molecules for which various quantum chemistry methods give poor agreement with experimental results. Also recommends alternative computational methods that give better results. http://srdata.nist.gov/sicklist/