Veusz is a GUI scientific plotting and graphing package. It is designed to produce publication-ready Postscript or PDF output. SVG, EMF and bitmap formats export are also supported. The software runs under Unix/Linux, Windows or Mac OS X, and binaries are provided. Data can be read from text, CSV or FITS files, and data can be manipulated or examined from within the application.

Veusz is a scientific plotting package. It was written as I was dissatisfied with existing plotting packages as they were either old and unmaintained (like pgplot and qdp, which does not support postscript fonts), not free (like IDL or Matlab), or had user interfaces I do not appreciate (like gnuplot).

Veusz is designed to be easily extensible, and is written in Python, a high level language (in the future it may be necessary to write some parts in another language for speed, but this will be kept to an absolute minimum). It is also designed in an object oriented fashion, where a document is built up by a number of parts in a hierarchy. The advantage of using Python is that is is easy to allow the user to script Veusz using Python as a very strong scripting language. Indeed, the saved file format is a Python script.

The technologies behind Veusz include PyQt (a very easy-to-use Python interface to Qt, which is used for rendering and the graphical user interface, GUI) and numpy (a package for Python which makes the handling of large datasets easy).

Veusz has two user interfaces: a graphical one which gives the user a relatively shallow learning curve, and a command line interface. The command line interface is also used by scripting and in the saved file format.

Furthermore, Veusz can be embedded within other Python programs, with plots in their own windows, or it can be controlled from any other application.

In Veusz plots are created by building up plotting widgets with a consistent object-based interface. The software also provides a command line and scripting interface (based on Python) to its plotting facilities. It can also act as a Python plotting module.

Veusz Features:
1. X-Y plots (with errorbars)
2. Images (with colour mappings)
3. Contour plots (filled/unfilled)
4. Stepped plots (for histograms)
5. Bar graphs
6. Line plots
7. Function plots
8. Stacked plots and arrays of plots
9. Plot keys
10. Plot labels
11. Shapes and arrows on plots
12. LaTeX-like formatting for text
13. EPS / PNG / PDF / SVG / EMF output
14. Simple, CSV and FITS data importing
15. Scripting interface
16. Dataset manipulation
17. Embed Veusz within other programs

The license of this software is Freeware, you can free download and free use this graphing software.