BeepBeep is freely available under the GNU Lesser General Public License. This means you can include it as a library in any project, including closed-source commercial software.
The easiest way of using BeepBeep is to download a JAR file of the latest release. Put it in your project's classpath and you're good to go.
The main JAR file only includes BeepBeep's core classes and basic processors. You may also be interested in downloading one of many palettes that extend BeepBeep's capabilities.
Otherwise, you may want to download BeepBeep's source code and build it by yourself. Please refer to the
Readme file contained with the source code distribution for detailed build instructions.