Dia
Open SourceDia is free and open source drawing software.
Flowchart Softwares and Apps
Discover best Flowchart softwares, apps and websites.
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draw.io
Open Sourcedraw.io is free online diagram software for making flowcharts, process diagrams, etc
PlantUML
Open SourcePlantUML is an open-source tool allowing users to create UML diagrams from a plain text language.
Calligra Flow
Open SourceCalligra Flow (Kivio) is free diagramming software that is a part of Calligra Suite, an integrated graphic art and office suite by KDE.
Diagramo
Open SourceDiagramo is an online flowchart software. It's FREE and Open Source ( GPL ) It's pure HTML5 Share and collaborate.