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Quantum ESPRESSO is a free, open-source software package for electronic structure calculations and m (more)aterials modeling, based on density functional theory (DFT). It is a powerful tool for predicting the properties of materials and molecules using first-principles calculations, which are based on the fundamental laws of quantum mechanics. Quantum ESPRESSO includes a suite of programs for performing calculations on periodic systems, such as crystals and molecules, as well as on isolated systems, such as atoms and clusters. It can be used to predict a wide range of properties, including electronic structure, phonon dispersion, and optical spectra. Quantum ESPRESSO is widely used in the fields of physics, chemistry, and materials science, and it is distributed under the GNU General Public License (GPL). It is available for a variety of platforms, including Windows, macOS, and Linux, and it can be downloaded from the Quantum ESPRESSO website. Operating system: Linux macOS License: GNU General Public License

Operating system: Linux, Windows, macOS License: LGPL

Operating system: Linux, OS X License: GNU General Public License, version 3.0

Baudline is a software tool that is used for signal analysis, visualization, and exploration. It is  (more)particularly well-suited for analyzing and visualizing time-varying data, such as audio signals, radio waveforms, and other types of time-series data. Baudline provides a range of features that make it easy to analyze and visualize signals, including tools for filtering, Fourier transformation, and spectral analysis. It also provides a number of visualization options, including 3D spectral displays, oscilloscope-style views, and spectrograms. Baudline is available for free as an open-source software tool, and it is compatible with a number of operating systems, including Linux, macOS, and Windows. It is often used in scientific and technical applications, such as audio engineering, radio communication, and signal processing. Baudline provides a range of features that make it easy to analyze and visualize signals, including tools for filtering, Fourier transformation, and spectral analysis. It also provides a number of visualization options, including 3D spectral displays, oscilloscope-style views, and spectrograms. Operating system: FreeBSD, Linux, Mac OS X, Solaris License: proprietary subscription

Operating system: Microsoft Windows License: Proprietary Freeware

Phyz is a web-based physics simulation tool. It allows users to create and run simulations of physic (more)al systems, such as pendulums, springs, and collisions. The tool includes a range of features for creating and manipulating simulations, including a graphical user interface and a programming interface. Phyz is developed by a team at the Athens University of Economics and Business in Greece. Operating system: Microsoft Windows License: Public domain