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: Wireflow is a web-based wireframing and mockup tool used to create prototypes and specs for website and app designs. It provides a drag and drop editor to quickly layout pages and interfaces.
Type: software