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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 LibreOffice
Office suite
★ 3K Office suite License: MPL-2.0LibreOffice is an integrated office suite based on copyleft licenses and compatible with most document formats and standards. Libreoffice is backed by The Document Foundation, which represents a large independent community of enterprises, developers and other volunteers moved by the common goal of bringing to the market the best software for personal productivity. LibreOffice is open source, and free to download, use and distribute.
Sure, Visio 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 , LibreOffice .