Open Source Data Visualization Projects
Tools for creating interactive charts, graphs, dashboards, and visual representations of complex datasets.
Draw.io
draw.io is a JavaScript, client-side editor for general diagramming.
Alternative to: 
Miro
Miro
ExcaliDash
A self hosted dashboard and organizer for Excalidraw with live collaboration.
Alternative to: Miro
Miro
Metabase
Open-source business intelligence tool for dashboards, self-serve analytics, and embedded analytics on top of your company databases.
Alternative to: 
Tableau
Tableau