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Pencil is an open-source project powered by Electron, a Nodejs-based environment.
Although aimed at GUI prototyping, Pencil can also be used to create diagrams.
SpecsUpdate
PlatformsWindows Linux Mac
Pros
Cons
Recommendations
Pencil Project
Recommended 6 years ago
Easy tool to use that is completely portable.
Pro
FreePro
MultiplatformPencil Project
Recommended 4 years ago
ProfessionalHeka hasn’t added their experience, pros or cons to their recommendation.