SDF Viewer/database

ChemFileBrowser
http://www.hyleos.net/?s=applications&p=ChemFileBrowser

sMOL Explorer: an open source, web-enabled database and exploration tool for Small MOLecules datasets
http://www3a.biotec.or.th/isl/index.php/smol-explorer

PowerMV: A software environment for statistical analysis, molecular viewing, descriptor generation, and similarity search.
http://www.niss.org/PowerMV/

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ChemSpider - Database of Chemical Structures and Property Predictions
http://www.chemspider.com/

Creating a Web-based, Searchable Molecular Structure Database Using Free Software
http://merian.pch.univie.ac.at/~nhaider/cheminf/moldb.html