

SpeedCrunch is another free, open-source, and cross-platform compatible calculator providing a list of enhanced and advanced features and functions. It also provides a user-friendly interface to Gnuplot and interactive dialogs for functions, with descriptions and entries for arguments. Furthermore, the platform also offers capabilities to display to the user whether the result is precise or not. The diverse and enhanced calculator comes feature-packed with innumerable functionalities, such as interactive GUI (i.e., Graphical User Interface) implemented using KDE or GTK+-2.0 and Glade XML, flexible expression entry and separate result display, practical menus enable efficient access to the list of enhanced features, calculation history, optional traditional calculator buttons, ability to create and modify functions, variables and units, efficient and easy features for editing vectors and matrices, integrated periodic table, small separate utilities for a unit, base and currency conversion, enhanced completion and meta modes, calculation and parsing capabilities, and the list goes on.
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Qalculate is a free and open-source multi-purpose calculator that enables students, office staff, and other such sectors around the globe. Thence, offering an unending pool of functions and capabilities that are enhanced on daily basis by the active community of the contributors.

The discussed calculators are free and open-source and are compatible across most of the operating systems. However, to perform more advanced and sophisticated calculations including the capability to plot graphs in 2D and 3D, and much more, a list of exceptionally sophisticated and efficient calculators is compiled here in this article. With every operating system, there comes a calculator that is capable of performing basic calculations and functions including trigonometric functions, logarithms, factorials, parentheses, and a memory function.
