Weka has been developed in Java by the University of Waikato in New Zealand, and its name is due to a flightless bird that can be found in this country. These algorithms can be applied straight to a database or they can be called from their own Java code.
The application includes tools to process the data, classify it, for regressions, for clustering, for association rules or for visualization. It is also perfectly prepared for the development of new learning schemes about machines.
Forget about pay-to-use options to carry out data mining. Download Weka to your PC for free and start working with large amounts of information.