Description: Pencil Project is a free and open source GUI prototyping and mockup tool. It allows users to create wireframes and prototypes for software interfaces and websites quickly and easily, without programming knowledge.
Type: software
Pricing: Open Source
Description: TouchDraw is a vector graphics editor designed specifically for touchscreen devices like iPads and Android tablets. It allows users to create diagrams, illustrations, flowcharts, UI mockups, website wireframes and more using a touch-based interface and vector tools.
Type: software