Tabler - Admin panel made simple
Axure - The most powerful way to plan, prototype and hand off to developers, all without code. Download a free trial and see why professionals choose Axure RP 9.
Jet Admin - Build business apps really fast
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Forest Admin - Execute fast and at scale with no time wasted on internal tools developed in-house.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project