WikiCalc
ThoughtStorms Wiki
Context : SpreadsheetsAndWiki
DanBricklin's (creator of the original SpreadSheet) made a combination of wiki and SpreadSheet.
It went around the world (was bought by SocialText who I think no longer exist) but still seems to be up on his original site.
Compare :
- Fitnesse (part of FIT) which also has tables in wikis.
My software, from SdiDesk through to CardiganBay has always liked the DoubleComma format for tables. Not a spreadsheet though ...
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yet.