SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
OriginLab - OriginLab is a data analysis tool that provide the engineers and scientist with the technical charts and system for 2D and 3D plotting and all kind of fitting including curve and peak fitting.
IBM SPSS Statistics - IBM SPSS Statistics is software that provides detailed analysis of statistical data. The company behind the product practically needs no introduction, as it's been a staple of the technology industry for over 100 years.
IGOR Pro - Technical graphing and data analysis for Macintosh and Windows.
LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.
Kst - KDE Homepage, KDE.org