3DSlicer

3D Slicer is an open source software platform for medical image informatics, image processing, and three-dimensional visualization. Built over two decades through support from the National Institutes ...
Language(s): C++, Python, Qt
Operating system(s): Linux, Mac OS X, Windows
License: BSD license

Avogadro

Avogadro is an advanced molecule editor and visualizer designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science, and related areas. It offers f...
Language(s): C++, Qt
Operating system(s): Linux, macOS, Unix, Windows
License: Public domain, GPL v2

Calligra

Calligra Suite is a graphic art and office suite by KDE. It is available for desktop PCs, tablet computers, and smartphones. It contains applications for word processing, spreadsheets, presentation, d...
Language(s): C++ (Qt, KDE Platform)
Operating system(s): Unix, Linux, Windows, Android
License: GPL, LGPL

FreeMat

FreeMat is a free environment for rapid engineering and scientific prototyping and data processing. It is similar to commercial systems such as MATLAB from Mathworks, and IDL from Research Systems, bu...
Language(s): Assembly language, C, C++, Fortran, Qt
Operating system(s): Linux, Mac OS, Windows
License: GNU General Public License

Kdenlive

Kdenlive is a free and open-source video editing software based on the MLT Framework, KDE and Qt. The project was started by Jason Wood in 2002, and is now maintained by a small team of developers. ...
Language(s): C++ (Qt, KF5)
Operating system(s): Windows, Mac OS X (source code only)
License: GNU GPLv2+