Kst is a free and open source data viewer and plotting application for Linux, Windows and MacOS. Using Kst you can display and analysis scientific data. It is released under GNU General Public License v2.0. You can extend its feature via plugins. It comes with plotting of live data, keyboard and mouse plot manipulation, histograms, equations, power spectra, color mapping, filtering and curve fitting, command-line interface support, annotation objects and also the data export to bitmap or vector formats.