Does a concurrent office document collaboration service exist that does not rely on 3rd party servers?

By "collaboration" I mean changes made to a document are quickly visible to others that have the document open.

Office 365 and Google Docs have nice collaboration features, but they require use of their servers.

closed as off-topic by DavidPostill Jul 19 '17 at 22:03

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SubEthaEdit for Mac (formerly Hydra) may have been the first realtime collaborative editor, and is still around. It's serverless; each running instance can act as a server for any open docs.

Search for "collaborative editor" for other choices. You may need to be specific about what features and platforms you require.

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