Software similarity and classification is a book by Silvio Cesare and Yang Xiang published by Springer.
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Simseer is an online set of web services that perform malware similarity searching and clustering. Simseer creates signatures of malware using control flow as a fingerprint.
Bugwise is an online web service that anlyses binaries for bugs. It combines the techniques of decompilaion and data flow analysis to identify a number of bug classes.
Clonewise is an online web service to detect package-level clones in source code. You submit a tar ball of your source and Clonewise identifies any embedded open source libraries.