What are some alternatives?
Invision - Prototyping and collaboration for design teams
WiX - Create a free website with Wix.com. Customize with Wix' website builder, no coding skills needed. Choose a design, begin customizing and be online today
Zeplin - Collaboration app for UI designers & frontend developers
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.
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
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.