You can also use a basic WYSIWYG web editor to create prototypes and wireframes. The only down side is some may make it look nice, but the produced code is crappy.
Microsoft Expression Web 4
https://www.microsoft.com/en-us/download/details.aspx?id=36179
KompoZer
http://kompozer.net/
SeaMonkey Composer (Mozilla Composer)
http://www.mozilla.org/projects/seamonkey/
openElement
http://www.openelement.com/