Is there an open source realtime collaborative wiki engine?

I am looking for a wiki engine that is:

• open source
• r开发者_开发问答eal time
• collaborative

A sort of mix between MediaWiki and an open source version of Google Docs where several users could see each other's edits in real time.

Is there such a state-of-the-art beast?

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Haven't seen one, but you may be able to build off of Sobby/Gobby in order to create one.

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Etherpad-Lite with linkify plugin is the closest thing that you can find:

https://github.com/Pita/etherpad-lite

The linkify plugin can be installed by simply typing:

npm install ep_linkify

once you have Etherpad-Lite installed.

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You may also want to check out this experimental extension to MediaWiki: http://www.mediawiki.org/wiki/Extension:EtherEditor

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EtherPad

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I think you've answered this primarily - Google Wave or Google Docs are the big players here, though there's lots of others.

From a wiki perspective, most wiki's are written with the expectation of relatively non-granular changes (larger chunks than is typically found in collaboration). It may not be out there, and just waiting for someone like you to write it ;)

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Maybe try PmWiki or PukiWiki?

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I'm trying to find a similar solution for non-profit and NGO organizations and small friend groups.
Something which combines
a) one-to-group of Facebook or Google+,
b) document creation of TiddlyWiki and
c) simultaneous editing of EtherpadLite

I've found Kune to be among the better implemented candidates as one of it's main design goals is ease-of-use for small groups, communities and non-profits.
Zero system administration as hosting is free.
Ease of customization via Wave Gadgets. While still in alpha stage it looks good.

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Atlassian's Confluence now ticks say two and half of these boxes. It has real-time collaborative editing - it's commercial though, but you can look at the source if you sign an NDA with them