I notice https://toolserver.org/~diberri/cgi-bin/html2wiki/ expired: can someone port it to Labs (or even just temporarily resurrect in on Toolserver), please?
I know there's also http://tools.wmflabs.org/magnustools/html2wiki.php , but I usually try both and pick the best output; Magnus' tools is IIRC considered best for tables, I often got better results from the others.*
(*) Example with one huge page from a dozen of messy etherpads: <https://www.mediawiki.org/w/index.php?title=Language_portal/Daily/2012%E2%80%932013&action=history>
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