Platforma - Wireframe library of layouts and UI elements
Wirify - 29 Sep 2017 . Wirify is available in two versions: Wirify is free and available on the homepage; Wirify Pro is available to customers with active Wirify credits. Wirify and Wirify Pro menu items - Wirify user guide.
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Wireframe.cc - Sweet and simple online wireframing tool.
Method Wireframe Kit - Find your method of being incredibly fast in prototyping.