Calcpad

CalcPad is a mathematical and engineering calculator that works with input scripts and can display output in HTML forms, while allowing you to create input forms that only require users to enter a set of parameters.

Calcpad is free and open source. It is distributed under the MIT license. The source code is available on both SourceForge and GitHub. It is simple and easy to use, but also includes many advanced features:

• real and complex numbers;
• units of measurement (SI, Imperial and USCS);
• custom variables and units;
• built-in library with common math functions;
• custom multi-parameter functions f(x; y; z; ...);
• powerful numerical methods for root and extreme search, numerical integration and differentiation;
• finite sum, product and iteration procedures;
• modules, macros and string variables;
• control program flow with conditions and loops;
• comments "titles" and "text" in quotes;
• support Html and CSS in comments for rich formatting;
• draw functions, images, tables, parametric SVG drawings, etc.;
• automatic generation of Html forms for data entry;
• professional looking Html reports for viewing and printing;
• export to Word documents (*.docx) and PDF;
• variable substitution and intelligent number rounding;
• control of output visibility and content folding;
• support for text (*.txt, *.cpd) and binary (*.cpdz) file formats.