More details are here: diffbot.com

Diffbot is a developer of machine learning and computer vision algorithms and public APIs for extracting data from web pages / web scraping

Set of classes in com.diffbot.api package is an object oriented API of Diffbot:

public class Main {
  public static void main(String[] args) {
    final Diffbot diffbot = new RtDiffbot(".. your OAuth token ..", "..version..");
    final Article article = diffbot.article(".. url ..");
    System.out.println(new Article.Smart(article).title());
  }
}

Reucon-Commons needs a Java Virtual Machine of at least version 1.7 (Java SE 7.0). If you want to build the jar from source, you will also need Maven.