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So is Excalidraw
Quadro branco para desenhar diagramas com aparência de feitos à mão
★ 96.2K Diagram Whiteboard License: MITUm quadro branco virtual de estilo desenhado à mão em código aberto. Colaborativo e criptografado ponta a ponta.
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So is Draw.io
JavaScript, client-side editor for general diagramming
★ 53.5K Diagram License: Apache-2.0Browser-based diagramming components and applications.
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So is D2
Turn text into diagrams
★ 20.1K Diagram License: MPL-2.0A modern diagram scripting language that turns text to diagrams.
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So is Mermaid Live Editor
Edite, pré-visualize e compartilhe gráficos/diagramas mermaid
★ 4.7K Diagram License: MITEdite, visualize e compartilhe gráficos/diagramas mermaid.
Sure, Lucidchart is awesome.
But have you considered these open source alternatives?
They are free, self-hostable and community-driven.
Check by yourself: Excalidraw , Draw.io , D2 , Mermaid Live Editor .