Argdown is an interesting Markdown syntax for constructing argument maps. argdown.org
It has some unusual non-linear writing features: e.g. you can give statements/arguments titles and elsewhere refer to them as supporting/undercutting others.
Conversation
See also Kialo, a Wiki-like platform for collaborative constructing argument maps, e.g.
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Man I'd love to see a argument map with Tom Woods, or Steven Sailer, or any of a million other people.
