Balsamiq Wireframes 4.6.6 (x64)
WireframeSketcher comes both as a standalone application but also as a plug-in for any Eclipse IDE. It’s cross-platform and has a native and fast UI on Windows, Mac OS X and Linux. Create anything from quick mockups to large prototypes. Built-in refactoring lets you painlessly rename and move files around without breaking links. Flexible UI lets you take advantage of multiple monitors.