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In keeping with this goal, the HDF libraries and associated tools are available under a liberal, [[BSD licenses|BSD-like license]] for general use. HDF is supported by many commercial and non-commercial software platforms and programming languages. The freely available HDF distribution consists of the library, command-line utilities, test suite source, Java interface, and the Java-based HDF Viewer (HDFView).<ref>[http://www.hdfgroup.org/products/java/release/download.html Java-based HDF Viewer (HDFView)]</ref>
The current version, HDF5, differs significantly in design and [[API]] from the major legacy version HDF4.
==Early history==
The quest for a portable scientific data format, originally dubbed AEHOO (All Encompassing Hierarchical Object Oriented format) began in 1987 by the Graphics Foundations Task Force (GFTF) at the National Center for Supercomputing Applications (NCSA). NSF grants received in 1990 and 1992 were important to the project. Around this time [[NASA]] investigated 15 different file formats for use in the [[Earth Observing System]] (EOS) project. After a two-year review process, HDF was selected as the standard data and information system.<ref>{{cite web|url=http://www.hdfgroup.org/about/history.html|title=History of HDF Group| access-date=15 July 2014}}</ref>
==HDF4==
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