Batflat - Lightweight, fast, easy, and free CMS.
WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
Rubedo - Rubedo is an open source big data CMS & E-commerce with Behavioral targeting.
SquareSpace - Squarespace is the easiest way for anyone to create an exceptional website. Pages, galleries, blogs, e-commerce, domains, hosting, analytics, 24/7 support - all included.
Joomla Video Plus Theme - Video Plus is a free joomla template suitable for building a video sharing website.
Google Sites - Access Google Sites with a free Google account (for personal use) or G Suite account (for business use).