Ubuntu is a free operating system. Ubuntu project: "We believe in fast, effective computing for everyone. Created by the open-source community and Canonical, Ubuntu is free to use and share, at home and in business."
Moodle is a Course Management System (CMS), also known as a Learning Management System (LMS) or a Virtual Learning Environment (VLE). It is a Free web application that educators can use to create effective online learning sites.
PLoS is a nonprofit organization of scientists and physicians committed to making the world's scientific and medical literature a freely available public resource.
A Former Ancient History student, currently pretending to be a Librarian. I am particularly passionate about Libraries engaging with their community, and how the Library of the future will be shaped. All views expressed are my own :)