Sicyon Calculator

Sicyon is an all-in-one scientific calculator for every student or professor, researcher or developer-everybody doing physics or chemistry/science or engineering using formulas and tables of constants. It is easy-to-use and has everything you need to calculate or investigate a function - chart, roots, min/max, integral, derivative, fit data over, etc. Sicyon calculator combines an intuitive interface and an object oriented approach to provide a fast learning curve while staying at a high level of efficiency. Sicyon calculator is a freeware (under the Creative Commons by-nv-nd-3.0 licence).

Sicyon Features :    

• Calculate the value of a math expression using variables and user-defined functions.
• Program mode' allows you to execute script code in the main window.
• Easy access to user-defined functions (JScript™ or VBScript™ languages) by buttons organized in function boards.
• Searchable tables with various physical and chemical constants arranged in data boards (~50 of them)
• Editable spreadsheet-like user-data boards.
• Plug-In additional applications called tool boards, usable as objects in the script.
• Organize the boards as tabbed pages in groups with a board browser for easier access and search.
• Plot / tabulate a function in Explicit or Parametric mode. Draw many curves / surfaces on the same chart (multi-chart). You can combine 2D and 3D graphs, with data from user data boards or the clipboard.
• Solve nonlinear system of equations. Sicyon will find all the solutions of nonlinear system of up to 6 equations.
• Projects' collection of curves and surfaces (more than 100 of them).
• Find minima and maxima in 2D and 3D with chart.
• Find definite integral in 2D and 3D of an expression in a given interval.  In 3D - partial derivatives (∂/∂x, ∂/∂y and ∂²/∂x∂y) with chart 
• Fit a curve over data set (non-linear regression)
• Fit batch of data sets to the same function and gives the fitted coefficient results and batch statistics in a table.
• Fit more than 3300 functions over a single data set and present the list of the best fitted functions with their coefficients.
• Customizable (template based) HTML reports for all math procedures.
• Use a sophisticated unit of measurement converter, same functionality as Sicyon Unit Converter
• Use matrices and matrix calculations.
• Context help on any level of organization - function buttons/ boards/groups.

Source : www.sicyon.com