Kst is the fastest real-time large-dataset viewing and plotting tool available and has basic data analysis functionality.
Kst contains many powerful built-in features and is expandable with plugins and extensions. Extensive help is available, both from within Kst and on the web.
Kst is licenced under the GPL and is freely available for anyone.

Features of Kst include:

• Robust plotting of live "streaming" data.
• Powerful keyboard and mouse plot manipulation.
• Powerful plugins and extensions support.
• Large selection of built-in plotting and data manipulation functions, such as histograms, equations, and power spectra.
• Color mapping and contour mapping capabilities for three-dimensional data, as well as matrix and image support.
• Monitoring of events and notifications support.
• Built-in filtering and curve fitting capabilities.
• Convenient command-line interface.
• Powerful graphical user interface.
• Support for several popular data formats.
• Multiple tabs.
• Extended annotation objects similar to vector graphics applications.

A full list of Kst's features as well as a roadmap for future features and releases is available on the features page.