WEKA - WEKA is a set of powerful data mining tools that run on Java.
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
Orange - Machine learning for novice and experts.
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.
RapidMiner - RapidMiner is a software platform for data science teams that unites data prep, machine learning, and predictive model deployment.
LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.