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Searching a Mind Map FOSS software
(feddit.it)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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I use the Mindmark plug-in for Logseq most of the time. I have used and liked FreeMind in the past.
Likewise the graph view for obsidian (not foss) or foam (extension for vscode/vscodium) . The graph view is perhaps less useful than the traditional mind map (great if you just want to see connections though) but overall these options are much more powerful