QtiPlot is the low-cost professional alternative to expensive proprietary scientific software like Origin, SigmaPlot, Regressi or Igor Pro. QtiPlot is used for teaching as well as for complex data analysis and visualisation in companies, high schools, universities and reseach institutes all over the world.

QtiPlot is a program for two- and three-dimensional graphical presentation of data sets and for data analysis. The plots can be produced from data sets stored in tables or from analytical functions.

The projet has been created by Ion Vasilief in 2000, and he was the only programmer between 2000 and 2005. Since 2006, new contributors have joined Ion and the project is hosted by BerliOS Developper. The software aims to be a tool for analysis and graphical representation of data in the way of commercial software like Origin.

QtiPlot is a dynamic tool, the plots created from data sets and the spreadsheets owing the data are interconected. When the spreadsheets are modified, all the objects in the depending plots (curves, axes scales, legends) are automatically updated. For example, deleting a spreadsheet or only some columns will automatically remove all the corresponding curves from the depending plots.

QtiPlot Features:
1. Cross-platform: works natively on Windows, Mac OS X and Linux/Unix systems
2. Fully Python scriptable
3. OpenGL based 3D plotting
4. Publication quality plots and easy export to various image formats (EMF, EPS, PS, PDF, SVG, BMP, JPG, PNG, TIFF, etc ...)
5. Easy integration with LaTeX typesetting system
6. Powerful and versatile spreadsheets with column-logic calculations and easy import/export of multiple files
7. One-click access to extensive built-in data analysis routines
8. Linear and nonlinear curve fitting with weighting and estimation of statistical errors of the fit-parameters
9. Multi-peak fitting
10. Image analysis tools
11. Templates support: all settings for plots, tables and matrices can be saved and restored later on for a fast editing process
12. Project files based on folders, a powerful project explorer with built-in drag and drop and searching facilities
13. Full import of Origin projects, Excel workbooks (.xls files) and Open Document Format spreadsheets

Requirements:
* Qt 4.2 or above
* Python 2.5

Limitations:
* Saving to project files is disabled
* Usable for maximum 10 minutes per session

The license of this software is Free Trial Software, the price is $19.90, you can free download and get a free trial.