Ruby-Processing can load a whole mess o' libraries. From pure-Java libraries, to hybrid Java-C native libs, to pure-Ruby ones, you can make them all get along. Use the class method load_library "my_lib". This will look in the directory library/my_lib, and load in the Java or Ruby library that it finds by that name. So, all together now, an example that loads both hemesh and the vbo (java and ruby)