Pencil - convenient open-source free prototyping tool for creating mockups. It is suitable for creating any user interfaces, but we will consider creating web interfaces.

Can be installed as a firefox plugin or as a standalone application (in this case, firefox was installed as a dependency).

Convenient for quickly creating a website page schema, so as not to draw on paper. It also allows you to add interactivity by linking pages. A simple and fast learning tool.

We will explain the installation and show an example of use.