The best free alternative to Creately is diagrams.net, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Creately and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Creately are yEd Graph Editor (Free), LibreOffice - Draw (Free, Open Source), Dia (Free, Open Source) and PlantUML (Free, Open Source).
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Enter your lists here. Use either the "text area" or "file upload" to assign your list to the diagram. Files should be delimiter ASCII files (Any white space like space, tab, or line break, and comma).