Here's a summarization I'd like (and would pay for[0]): chats. I mean IRC logs, Slack & Telegram groupchat logs, etc. Between work and local Hackerspace, people produce so much text on IM that I can't really keep up with it. I'd love a solution that I could feed such chat logs, and get back e.g. list of topics covered.
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[0] - as long as it wasn't a cloud SaaS where I have to share my data with vendor's machines.