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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.
You are asking an off-topic question (software shopping). Questions seeking product, service, or learning material recommendations are off-topic. See On Topic. Try https://softwarerecs.stackexchange.com/ but please first read What is required for a question to contain "enough information".
– DavidPostill – 2017-07-19T22:03:31.840