LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
DPlot - DPlot graphing software lets scientists and engineers graph, plot, analyze, and manipulate data.
DataMelt - DataMelt (DMelt), a free mathematics and data-analysis software for scientists, engineers and students.
Aveloy Graph - Aveloy Graph is an application for graph creation / data visualization
Dream Calc - DreamCalc is an intuitive and versatile scientific calculator application that contains a vast range of scientific and numerical functions.