Mockup Designer Alternatives for Linux

Lucidchart is a leading web-based diagramming software that empowers individuals and teams to create complex visual representations of ideas, systems, and processes. It offers extensive shape libraries, real-time collaboration features, and seamless integration with popular productivity tools, making it ideal for flowcharts, UML diagrams, wireframes, and more.

Pencil Project is a free and open-source GUI prototyping tool that helps designers and developers create wireframes and mockups easily. Available as a standalone application and a Firefox extension, it offers a wide range of built-in shapes and templates for various platforms.

UXPin is a comprehensive design platform for creating interactive prototypes, wireframes, and mockups. It facilitates seamless team collaboration throughout the design process, from initial concept to developer handoff.

Pidoco is a cloud-based prototyping and wireframing tool enabling teams to collaboratively design, test, and iterate on user interfaces and experiences for web and mobile applications. It streamlines the design process from initial sketches to interactive prototypes.