New ask Hacker News story: Ask HN: Is there any free/FOSS diagram/mind mapping app iOS that doesn’t suck?

Ask HN: Is there any free/FOSS diagram/mind mapping app iOS that doesn’t suck?
2 by duelingjello | 1 comments on Hacker News.
I’ve tried around a dozen apps but haven’t found anything usable or doesn’t have some arbitrary limits / mandatory on-going fees for some unmaintained app.