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Wireframe.cc - Sweet and simple online wireframing tool.
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
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.
ProtoShare - ProtoShare is a web-based, collaborative wireframing and prototyping tool.
Wireframe for Figma - Lightning fast wireframing on figma (500+ elements)
Invision - Prototyping and collaboration for design teams