Leibnitz is the calculator you've always wanted (even if you didn't know it!), short of handwriting recognition.
FAQ: https://github.com/jafl/jx_application_framework/tree/master/programs/leibnitz#readme
ChangeLog: http://leibnitz.sourceforge.net/ChangeLog.html
Multitask scientific calculator. Supports plugins and scripts (in C++ and QtScript respectively) to provide different working modes and custom solving functions.
Extcalc is a multifunctional scientific graphic calculator for linux with features like graph drawing, graph analysis and calculating scientific functions including differentiation, integration and logic functions.
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A graphing utility for the Pocket PC. User definable functions with 2D and 3D graph support. This calculator also supports matricies, lists, complex numbers and many math functions. Lua scripting is partially integrated.
Quicksolve is an interactive graphing calculator and programming language. It provides an intuitive interface for performing basic plots and calculations with a focus on numerical solutions. Versions will be available for both Gnome and Mac OS X.
KAlgebra is a MathML-based graphic calculator, thought to bring to the user its power by solving expressions written in MathML or calculating converted common equations to MathML. This project now belongs to KDE Edu. http://edu.kde.org
A linux calculator which maintains the option of the simple text-based experience of bc while adding features like function declaration, registers, and a gtk+2.0 GUI. There are many predefined functions and constants. Graphing is one of many future plans.
The Fung-Calc is an advanced, yet easy to use graphing calculator that supports graphing in both 2D and 3D. Several different plot types are available and graphs can be animated.
Virtual TI emulates nearly the entire line of Texas Instruments graphing calculators, and offers features that speed up both debugging and testing of calculator programs. Windows version is quite stable but the Linux/OSX version is only in planning.
QPlot - an Advanced Mathematical Calculator
Includes: natural-style input, 2-D and 3-D graphing,
differentiating, integrating, equation solving, C-like
PROGRAMMING, and a lot more!
What's most exciting, it is EXTENSIBLE!