RapidMiner (formerly YALE) provides an easy to use extension and plugin mechanism that makes it possible to integrate new operators and adapt RapidMiner to your personal requirements. RapidMiner is usable without graphical user interface (command line version). Furthermore, a clean Java API allows the usage of single operators or complete data mining processes or machine learning experiments directly from your Java applications. This turns RapidMiner into a library or interpreter for complex data mining tasks.

For most applications, you do not have to implement missing operators yourself. RapidMiner and its plugins already provide a broad variety of operators for most of the common and some uncommon knowledge discovery tasks. However, in some cases it might happen that you have to implement missing functionality yourself. Writing your own operators is very easy.

Furthermore, the RapidMiner plugin mechanism allows for plugins which can be easily written and packaged. Several plugins written by different authors are currently provided in order to enhance RapidMiner, e.g. plugins for time series processing or text document to word vector transformation.

In order to install a plugin you simply have to copy the downloaded plugin .jar file into the lib/plugins directory of RapidMiner. Windows users can alternatively download an executable installer file (.exe) which automatically installs the plugin at the correct position.