TbcParser is a mathematical expression parser VCL component that can be used with Borland Delphi 4,5,6,7 and Borland C++ Builder 3,4,5,6. Source code works with Kylix to compile and run in Linux as well.

TbcParser Component features include:

Easy to use component API.
Comes with predefined functions.
You can create custom functions/variables and get a callback to your own functions that you define in your source code.
Optimization: Constant expression elimination for repeated tasks.
Analytic Operators: +, -, /, *, ^
Logical Operators: <, >, =, &, |, !, <>, <=, >=
Paranthesis: (, {, [
Functions in the form of: f(x,y,z,...)
List of predefined functions is available in the documentation.
Royalty free distribution at affordable price.
Source code is included.