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Calcpad
Calcpad is a free and open source mathematical software, created by PhD Eng. Nedelcho Ganchovski in 2014. It is primarily designed to perform engineering calculations and document the results into calculation notes/reports in HTML, PDF or Microsoft Word format. Calcpad employs its own programming language with simplified syntax, suitable for engineers with minimal programming experience. The open-source GitHub project was discontinued in March 2026 and the development was continued as closed-source.