Wireframe.cc - Sweet and simple online wireframing tool.
Gridbox - Create beautiful landing pages in seconds.
WireframeSketcher - WireframeSketcher is a wireframing tool for creating wireframes, mockups and prototypes for desktop, web and mobile apps. It's a desktop app for Mac, Windows and Linux, and a plug-in for any Eclipse IDE.
SitePM - Creating and designing websites easier than ever before using the powerful features of SitePM. SitePM is a web content management system (WCMS) offered as a Software as a Service model.
Saola Animate - Easily create engaging HTML5 animations and interactive web content without coding skills
PageFabric - PageFabric is a free static website editor for Windows 10.