DataMelt: Free Computation and Visualization Environment

DataMelt,  or DMelt, is a free software for numeric computation, mathematics, statistics, symbolic calculations,  data analysis and data visualization. The program can be used in many areas, such as natural sciences, engineering, modelling and analysis of financial markets. It combines the simplicity of scripting languages, such as Python, Ruby, Groovy (and others), with the power of hundreds of Java packages. DataMelt is a takeover of jHepWork (1995-2013) and SCaVis (2013-2015). SCaVis is fully compatible with the jHepWork v3.9.

DMelt is available as:

  • Free Community Edition.
  • DMelt Membership.
  • Commercial & developers license.
Charts based on the HChart [src: DMelt]


  • Free Community Edition.
  • Portable (No installation needed).
  • Cross-Platform (Windows, Linux, Mac and Android).
  • Big Data support.
  • Supports multiple programming languages.


  • DataMelt is software for numeric computation, statistics, analysis of large data volumes (big data) and scientific visualization. The program can be used in many areas, such as natural sciences, engineering, modelling and analysis of financial markets.
  • It is a computational platform. It can be used with different programming languages on different operating systems. Unlike other statistical programs, it is not limited to a single programming language.
  • It runs on the Java platform but can be used with the Python language too. Thus it combines the world's most popular enterprise language with the most popular scripting language used in data science.
  • It allows the usage of scripting languages which are significantly faster than the standard Python implemented in C. For example,  DataMelt provides Groovy scripting which is a factor 10 faster than Python. Note algorithms implemented in Java are also significantly faster than those in Python.
  • Python programming can use more than 40,000 Java classes for numeric computation and scientific visualization. In addition, more than 4000 classes come with Java API, plus 500 native Python modules. Not to mention modules of Groovy and Ruby.
  • It creates high-quality vector-graphics images (SVG, EPS, PDF etc.) that can be included in LaTeX and other text-processing systems.

Supported Programming Languages:

  • Jython (Python programming language).
  • Groovy.
  • JRuby (Ruby programming language).
  • BeanShell.
  • Matlab/Octave.

All scripting languages use common DMelt JAVA API. Data analyses and statistical computations can be done in JAVA. Finally, symbolic calculations can be done using Matlab/Octave high-level interpreted language integrated with JAVA.

Supported Platforms:

DataMelt runs on Windows, Linux, Mac and Android operating systems. The Android application is called AWork. DataMelt is also available on Amazon EC2 cloud.

Portable and Commercial-friendly:

DataMelt is a portable application. No installation is needed: simply download and unzip the package, and you are ready to run it. One can run it from a hard drive, from a USB flash drive or from any media. DataMelt exists as an open-source portable application, and as Java libraries under a commercial friendly license.

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

Latest Version:

DMelt v2.4


DataMelt program available for free download is licensed by the GNU General Public License (GPL) v3 (or later), Mozilla Public License (MPL) and other open-source licenses.

However, documentation libraries, online examples, installer, code assist databases, Javadoc services, language files integrated inside the DMelt IDE and web services are free only for NON-COMMERCIAL purposes (academic research, science and education), and typically are available for users with activated DMelt (the DMelt membership is required).

Due to the GPL restrictions, the DMelt program available for download cannot be used in projects with closed source codes.



DataMelt (Community Edition) is a good free computation and visualization environment which is suitable only for open-source projects, academic research, science and education. If you intend to use DataMelt commercially, you will need to purchase a license, and you will get more features than the community edition.

Plausible: Self-hosted Privacy-aware open-source Google Analytics Alternative

Website Analytics is a crucial tool for website admins, content creators and marketers. While Google Analytics is the primary choice for many site admins and content creators, it is not easy to use, manage and learn. Furthermore, Google An.......Read more...

Ackee: The Google Analytics Open-source alternative for 2021

Ackee is a free real-time web analytics tool built on top of Node.js and MongoDB. It comes with a fancy simple user-interface which summarize all insights in a clear organized dashboard. While there are a dozen of open-source free website.......Read more...

The Best 15 Open-source Self-hosted Google Analytics Alternatives For 2021

Running a business without a website nowadays is like trying to climb the Kilimanjaro with a pair of flip-flops, but running a website without looking g at statistics is as useful as being in a submarine without a sonar you have no idea w.......Read more...

35 Data Science Python Libraries for Scientists

Python is an interpreted general-purpose programming language. It is used for web development, desktop application development, system scripting and automation. It is a high-level language created in the early 1991 by Guido van Rossum and.......Read more...

JASP: A Less Complicated Free Open-source SPSS Alternative for Advanced Statistics

Some time ago, We published an article listing all available open-source free  SPSS alternatives, today we will focus on one of that list's lead "JASP". 12 Free Open source Statistical Analysis software as SPSS alternativesSPSS is a pro.......Read more...