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.
Data Mining with Weka, a 5 week MOOC, started on September 9th 2013.
You can still enrol and sit all the classes and exams before the course closes on October 20th 2013: