The best Calculator alternative to SigmaPlot is LabPlot, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 10 alternatives to SigmaPlot, but unfortunately only two of them are Calculators.
LabPlot is a free, open source and cross-platform Data Visualization and Analysis software accessible to everyone and trusted by professionals.
Derive 6.1: Powerful system for doing symbolic and numeric mathematics. This application is no longer available or supported.
Germany
EU