- [OmniCalculator](https://www.omnicalculator.com/all) - quite literally all the calculators for all the [calculations](https://www.omnicalculator.com/all) you'll ever need!
- Math and [Music](https://www.mathe-vital.de/Musik/1-1.html)
- [SAGE](https://www.sagemath.org/) Math
- a free[open-source](https://web.archive.org/web/20220816223821/https://github.com/sagemath/sage/)mathematics software system licensed under the GPL. It builds on top of many existing open-source packages:[NumPy](https://web.archive.org/web/20220816223821/https://numpy.org/),[SciPy](https://web.archive.org/web/20220816223821/https://scipy.org/),[matplotlib](https://web.archive.org/web/20220816223821/https://matplotlib.org/),[Sympy](https://web.archive.org/web/20220816223821/https://www.sympy.org/),[Maxima](https://web.archive.org/web/20220816223821/http://maxima.sourceforge.net/),[GAP](https://web.archive.org/web/20220816223821/https://www.gap-system.org/),[FLINT](https://web.archive.org/web/20220816223821/http://www.flintlib.org/),[R](https://web.archive.org/web/20220816223821/http://www.r-project.org/)[and many more](https://web.archive.org/web/20220816223821/https://www.sagemath.org/links-components.html). Access their combined power through a common, Python-based language or directly via interfaces or wrappers.