Syncronia's services are free because the website is sponsored by the manufacturers. You will be asked later if you wish to receive advertisements but you can say no and will have no limitation to services. Subscribing to Syncronia will immediately allow you to:
Promote your business for free through a professional web area. Pages will be indexed on the search engines through your profession and location.
Download 3D libraries and many other tools for designing.
Why should I publish my project here? This area will be visible on Google searches for your profession in your city and in your language. Furthermore, some of the Partner companies publish on their website projects that show their products, giving you more visibility.