Napkee is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The best Linux alternative is Pencil Project, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Napkee and eight of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Napkee are Frame0, mydraft.cc, WireframeSketcher and UXPin.
Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
Sketch your app ideas without stress Make hand-drawn style wireframes quickly and easily.
WireframeSketcher is a software tool that helps product managers, designers and developers quickly create wireframes, mockups and prototypes for desktop, web and mobile applications. It’s standalone software and a plug-in for any Eclipse IDE.
UXPin is a web-based system for managing design documents like wireframes, sitemaps, persona descriptions or flowcharts. It lets you upload image files, invite teammates to review and comment on them, and keep track of revisions.
FlairBuilder is a user interface prototyping tool for easy authoring of interactive website wireframes, mockups and GUI prototypes.
HotGloo is a UX, wireframe and prototyping tool designed to build wireframes for web, mobile and wearables. Create and share fully interactive prototypes with your team and clients and gather feedback on the process.
EaSynth ForeUI is an easy-to-use UI prototyping tool. You can use ForeUI to create skinnable prototype of software or website, and run the interactive simulation in your web browser. You can switch the UI theme of the prototype, thus the fidelity will be changed as well.
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