The original author of DataMelt ("DMelt") is Dr. Sergei Chekanov who has started this project in 2005 at the DESY laboratory (Germany). At that time it was called jHepWork (2005-2013), and later - SCaVis (2013-2015). He is still making decisions about integration of the DMelt core package with 3rd party numerical libraries. He releases the community version of DMelt by incorporating free scientific packages from more than 100 Java developers around the world.

DMelt users

The number of registered DMelt members is several thousand, with uncounted number of users who use DMelt without membership registration. DMelt is hosted by the jWork.ORG portal where you can find more scientific programs.


DMelt is a collective work of many people dedicated to open-source scientific software. We are grateful to many authors writing free scientific software for their dedication to science and open-source analysis tools. Please look at this web page for more information about packages included to this project.

DMelt License

Available for free download DMelt program is licensed by the GNU General Public License (GPL) v3 or later. In addition, documentation libraries, examples, installer, code assist database, language files integrated inside the free version of the DMelt IDE software package are not licensed by GPL, and are free only for NON-COMMERCIAL purposes (academic research, science and education). Due to the GPL restrictions, DMelt Java libraries cannot be used in projects with closed source codes.

DMelt for commercial applications

In order to use DMelt Java libraries in commercial programs with closed-source environment, you will need to receive a redesigned version of this program suitable for commercial purpose. You should become DMelt member and request the redesigned DMelt program. The business-friendly DMelt includes libraries under "permissive" licenses, such as LGPL, MIT, Apache and BSD. In addition, one can use DMelt documentation and examples for commercial purpose.

Find out which DMelt is right for you using this link.

3rd party licenses

Licenses for the 3rd party libraries are located in the directory jehep/licenses.jar of the installed program. We made sure that all licenses are consistent with the GNU version of DMelt. In the case of redesigned DMelt for commercial purposes, all corresponding licenses should allow the usage of DMelt for commercial applications. If you noticed a violation of this principle, please contact dmelt(AT)jwork.org.

Documentation and examples

DMelt language files, documentation, examples, installers, code-assist databases and certain third-party libraries are subject to the Creative Commons Attribution-Share Alike License 2.0. You are free to copy, distribute, transmit, and adapt DMelt under the following conditions:

  • Attribution. You must attribute the work i.e. by linking to http://jwork.org/dmelt
  • Non-commercial. You may not use this work for commercial purposes. Please become a full DMelt member using member login page. After the registration, you can obtain a professional edition of DMelt suitable for commercial usage. It should be noted that the source code will remain under the terms of the GNU General Public License.
  • Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under the same, similar or a compatible license

Documentation for commercial applications comes with the full membership and DMelt activation.

DataMelt Project

DMelt: Computation and Visualization environment. 2005-2018.
jWork.ORG and S. Chekanov


jWork.ORG portal for scientific computations


Email: dmelt@jwork.org

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