Fityk [fi:tik] is a program for nonlinear least squares curve fitting. It is also useful for data processing and visualization.
Fityk is primarily used...
... but any functions can be fitted to any 2D (x-y) data.
Version 0.9.4 was released on 2010-10-09 (changelog).
FreshMeat provides new version notifications: emails and feeds.
Alternatively, you may donate via moneybookers to wojdyr@gmail.com
The manual (PDF) documents mainly commands of the fityk mini-language.
Trac Wiki contains all other informations. You are also welcome to contribute.
Citing fityk in academic papers: M. Wojdyr, J. Appl. Cryst. 43, 1126-1128 (2010) [reprint]
Join the Google group fityk-users. You may select option “no mail” and use the web interface to send messages. Feel free to send questions, comments, bug reports, new feature requests or success stories.
Asking for a new feature usually results in adding the request to the TODO list or, if it already is on the list, in assigning higher priority to it.
If for some reasons you do not want to use the group, you may contact directly the maintainer of the program: Marcin Wojdyr wojdyr@gmail.com.