Freetronics is an Australian company, created in early 2010 by Practical Arduino co-author Jonathan Oxer and technical reviewer Marc Alexander as a result of a deluge of requests for kits, parts, and other odds and ends relating to the book.
Since then they’ve launched many new products and are always busy creating more, following the Open Source principles of sharing designs to let other people build on their work just as they’ve built on the work of others.