Core Plot - Cocoa plotting framework for OS X and iOS
LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.
SwiftChart - Line and area chart library for iOS
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
SwiftCharts - kevinbrewster - Simple, Sexy Line Charts for Mac and iOS
DataMelt - DataMelt (DMelt), a free mathematics and data-analysis software for scientists, engineers and students.