QCalc is a cross-platform programmer's calculator that evaluates full C-syntax expressions, including bitwise operators, mixed hex/decimal/binary constants, and scientific math functions. It automatically displays integer results in formatted hexadecimal and binary, supports user-defined variables, expression history, and error handling. It runs as a Tcl/Tk script (qcalc.tcl) using the wish interpreter, available on both Windows and Linux via the open-source QTools Collection.
