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
C# Website system. This is going to be the "Newer" Internet, and even has a custom theme system. This is going to let users do "anything" that won't harm the client computer in any way.
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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.
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.