Pencil is a very interesting application with which you can make your own designs. In addition, it is aimed at providing a very simple and intuitive interface to make models and prototypes very quickly. Of course, it is a cross-platform software available for Linux, free, free and open source.
This project will allow you to do multitude of creations, from prototypes, to mockups, web page models, web apps, desktop application models (GUI), flow charts, and much more. Therefore, it is not only a tool for designers, it can also be very interesting for developers who want to see what the graphical interface of one of their projects would look like.
Includes various tools to facilitate editing, and even a large collection of predefined shapes so that you just have to insert them and with the different shapes that usually exist on a page or interface, and even for mobile apps. If you don't have enough of the ones that already come, you can also download more and add them easily. You will find a lot of downloadable material to install, such as designs for Bootstrap-based websites, Material Design style icons to design Android app interfaces, Twitter emojis, etc.
All these Stencils and Templates that you can download to have more material to work with, you can get it completely free of charge from this download area. They can be obtained completely independently and are installed as Pencil addons.
It is not in the repos of the distros, but you can download it as 64-bit Linux .deb package. You'll also find .rpm packages for other distros, as well as Windows and macOS. It even has an extension available for the Mozilla Firefox web browser. The last stable version released dates from 2019, and is 3.1.0, although you also have previous versions at your fingertips if you prefer ...
More information about Pencil - Official Website!