open source "Data Mining" softwares

Weka及RapidMiner都是開放源碼(open source)的資料採礦(data mining)軟體，功能算是數一數二。

Weka 3: Data Mining Software in Java
http://www.cs.waikato.ac.nz/ml/weka/
Weka is a collection of machine learning algorithms for data mining tasks. The algorithms can either be applied directly to a dataset or called from your own Java code. Weka contains tools for data pre-processing, classification, regression, clustering, association rules, and visualization. It is also well-suited for developing new machine learning schemes.
Weka is open source software issued under the GNU General Public License.

RapidMiner
http://rapid-i.com/index.php?lang=en
RapidMiner (formerly YALE) is the world-leading open-source system for knowledge discovery and data mining. It is available as a stand-alone application for data analysis and as a data mining engine which can be integrated into own products. By now, thousands of applications of RapidMiner in more than 30 countries give their users a competitive edge.

同類需要不少銀兩的商業軟體有MATLAB、SPSS Clementine。