RapidMiner is the new name given to what used to be known as YALE (Yet Another Learning Environment). It is one of the most useful and free open source data mining software available today. It is developed using the JAVA programming language and is capable of carrying out text mining, feature engineering, data stream mining, distributed data mining and multimedia mining. It is very flexible to use as users can use it through its GUI, command line or from other programs using the JAVA API. It also enables machine learning through the powerful library WEKA.