Where to put Writely, Google Docs, OLE...? #38
Description
Writely (2005/2006) was the first collaboratively web application word-processor. It had version tracking like in a wiki but no hyperlinks (editing took place one one document instead of a set of hyperlinked pages). It's company was bought by Google and the product eventually led to Google Docs. The wiki-like real-time editing capabilities of Writely/Docs were later changed influenced by Etherpad (2009) to track every keystroke instead of saved revisions only.
If the core of a wiki is documents directly being editable, Writely and Google Docs are kind of wikis. If hyperlinks between pages are a core part, then they are not.
However: Google Docs, Sheets & Draw are one of the rare applications that provide recursive transclusion: it's possible to put a spreadsheet into a presentation and include this into a document. This is similar to Object Linking and Embedding (OLE) in Microsoft products.