SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
itch.io - An online game marketplace and community.
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.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.