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PeCalc is a polyvalent engineering calculator for S&T students
...It also allows making changes of numeric base, prime factor decomposition, solving linear equation systems, statistical and financial computations, rational fraction decomposition and plotting some control engineering graphs.
PeCalc includes comprehensive user help in English and Spanish.
Currently PeCalc runs on Android and MS Windows. A version for GNU Linux is planned for the near future.
It has been developed in Object Pascal using Embarcadero Delphi. A Lazarus/Free Pascal version will be available soon too.