Header Dictionary Triples, or HDT, is a binary serialization format for RDF datasets. It is capable of compressing RDF data while maintaining search and browse operations without prior decompression1. HDT is an open format in progress of standardization2.
hdt-cppis a library and command-line tool to create and search HDT files3
hdt-javaallows integration of HDT with Apache Jena and Fuseki4
HDT-it!is a GUI application for browsing HDT files, which includes a 3D Visualization of the RDF adjacency matrix of the RDF Graph