\chapter{Acknowledgements}
\label{sec:Acknowledgements}

We thank SourceForge\footnote{\url{http://sourceforge.net/}} for providing a
great platform for open-source development.

We are grateful to the developers of
Eclipse\footnote{\url{http://www.eclipse.org}},
Ant\footnote{\url{http://ant.apache.org}}, and
JUnit\footnote{\url{http://www.junit.org}} for making these great
open-source development environments available.

We highly appreciate the operators and extensions written by several external
contributors. Please check our website for a complete list of authors.

We thank the Weka\footnote{\url{http://www.cs.waikato.ac.nz/ml/weka/}} developers for
providing an open source Java archive with lots of great machine learning
operators.

We are grateful to Stefan R\"uping for providing his implementation of a
support vector machine\footnote{\url{http://www-ai.informatik.uni-dortmund.de/SOFTWARE/MYSVM/}}.

We thank Chih-Chung Chang and Chih-Jen Lin for their SVM implementation
LibSVM\footnote{\url{http://www.csie.ntu.edu.tw/cjlin/libsvm/}}.

We would like to thank Stefan Haustein for providing his library
\java{kdb}\footnote{\url{http://www.me.objectweb.org/}}, which we use for several
input formats like dBase and BibTeX.

Thanks to the users of \rapidminer. Your comments help to improve \rapidminer for
both end users and data mining developers.