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Pencil Project

Single-user mockup / wireframing / diagramming tool

15 Alternatives To Pencil Project

BigHairyGoal

Get your ideas down and get insights on them.

Dia

Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.

Diagramo

Diagramo is an online flowchart software diagrams (create, edit and share)
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Figma

Team-based interface design, Figma lets you collaborate on designs in real time.

FreeMind

FreeMind is a premier free mind-mapping software written in Java.

Invision

Prototyping and collaboration for design teams
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LucidChart

LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.

Mindomo

Easy-to-create and share mind maps, concept maps, task maps and outlines. Mind mapping software for Web, Desktop, iOS and Android. Mind map with us for free!

PlantUML

PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.

Scapple

Scapple is an easy-to-use tool for getting ideas down as quickly as possible and making connections…
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Visio

Simplify and communicate complex information using data-linked diagrams.

Wired Designer

Simple but functional mockup designer based on Rough.js.

XMind

XMind is a brainstorming and mind mapping application.
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yEd Graph Editor

yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.