Official Apache Software Foundation owned and operated website.
Official Apache website.
pdfbox.apache.org is an official Apache Software Foundation owned / operated web site.
The Apache Software Foundation is a software distributor that manages various well-known free and open-source software products; most notably, the Apache HTTPD, which is the most popular web server in the world.
Other projects that are well-known amongst programmers and end users include the DVCS (Distributed Version Control System) Subversion, and the office suite OpenOffice.org.
More about the Apache Software Foundation at Wikipedia: https://wikipedia.org/wiki/Apache_Foundation
Related forum topic: https://www.mywot.com/en/forum/24290-official-apache-software-foundation-websites
This is one of the Apache Projects.