Etherpad (previously known as EtherPad) is a web-based collaborative real-time editor, allowing authors to simultaneously edit a text document, and see all of the participants' edits in real-time, with the ability to display each author's text in their own color. There is also a chat box in the sidebar to allow meta communication.
First launched in November 2008, the software was acquired by Google in December 2009 and released as open source later that month. Several services now use the Etherpad software, including PiratePad, Telecomix Pad, Framapad, Mozilla Pad (MoPad), PrimaryPad, TypeWith.me, Sync.in, QikPad, TitanPad and iEtherPad.com. Further development is coordinated by the Etherpad Foundation.
Features and implementation 
Anyone can create a new collaborative document, known as a "pad". Each pad has its own URL, and anyone who knows this URL can edit the pad and participate in the associated chats. Password-protected pads are also possible. Each participant is identified by a color and a name.
The software auto-saves the document at regular, short intervals, but participants can permanently save specific versions (checkpoints) at any time. Merging of changes as handled by operational transform. A "time slider" feature allows anyone to explore the history of the pad. The document can be downloaded in plain text, HTML, Open Document, Microsoft Word, or PDF format.
Etherpad was launched on 19 November 2008 by David Greenspan, Aaron Iba, and J.D. Zamfirescu (the latter two being former Google employees). They were later joined by former Googler Daniel Clemens and designer David Cole. The original website was
Etherpad was covered by Slashdot on November 21, 2008, resulting in server slowdown and downtime. This led the developers to temporarily revert the tool to closed beta, not allowing new pads to be created (but providing full and unrestricted access to the existing ones), while the server infrastructure was being improved. After the rewrite of the software was completed, the new version went live on 29 January 2009, and on 3 February, the site became again open to all.
When Google Wave was announced, the Etherpad team wrote on their blog comparing the two platforms and stating that the minimalist and targeted Etherpad interface could be an advantage in some use cases. Still, on 4 December 2009, Etherpad announced on its blog that it had been acquired by Google for integration into Google Wave. Existing Etherpad users would receive invites for Google Wave. On 31 March 2010, Etherpad announced that creation of new pads would be allowed until April 14 (pad creation was still allowed as of April 18, though) and existing pads could still be accessed and used until May 14. Options for download/export were available. The Etherpad service terminated on May 14.
Google released the source code for Etherpad under the Apache License version 2.0 on December 17, 2009. Subsequently, Google asked the Etherpad code maintainers to remove JSMin from its code tree due to a clause in its license stating, "The Software shall be used for Good, not Evil," which is not compatible with the open source licenses allowed on Google Code.
After the release of the software as open source, a number of people have set up Etherpad servers, as clones of the original website. Soon after, users and programmers of Etherpad, after an initial meeting in the #etherpad channel on freenode, created the Etherpad Foundation to coordinate further development. Their website maintains a list of a growing number of sites that run the Etherpad software.
Etherpad Lite 
Etherpad Lite have some distinctive features which are not available in the original version:
- An HTTP API which allows the user to interact with the pad contents, and with user and group management
- A jQuery plugin exists which helps embedding the collaborative editor in other sites 
- A PHP client which interfaces with the API 
- A Python client which interfaces with the API 
- A Ruby client which interfaces with the API 
- A Java client which interfaces with the API 
- An Objective-C client which interfaces with the API 
- A Perl client which interfaces with the API 
- Etherpad lite supports many languages. Localization is achieved collaboratively through translatewiki.net.
See also 
- Archive copy at the Wayback Machine
- "EtherPad Open Source Release, Google Code". Code.google.com. Retrieved 2013-02-14.
- Michael Arrington (19 November 2008). "Etherpad Shows Google Docs How It’s Done". TechCrunch.
- Philip Lenssen (20 November 2008). "EtherPad". Google Blogoscoped.
- "AppJet Company Overview". EtherPad. Retrieved 2013-02-14.
- "A Web App For Real-Time Collaborative Writing". Slashdot. 21 November 2008.
- "EtherPad Temporarily Reverts to Closed Beta". The Etherpad Blog. 21 November 2008. Archived from the original on 2010-01-02.
- Aaron Iba (29 January 2009). "Beta Update: Now running new EtherPad software". EtherPad Blog.
- Aaron Iba (3 February 2009). "EtherPad Now Open to All!". EtherPad Blog.
- Daniel Clemens (3 June 2009). "Google Wave Joins EtherPad in Real-time Collaboration". EtherPad Blog.[dead link]
- "Google Acquires AppJet". EtherPad Blog.[dead link]
- "EtherPad Homepage". EtherPad.
- Aaron Iba. "EtherPad Open Source Release". EtherPad Blog.
- Ryan Grove. "Etherpad source includes JSMin, which Google Code doesn't allow". Wonko.com.
- Thomas Nybergh. "Swedish Pirate Party hosts EtherPad.". Slashdot.
- "TomNomNom/etherpad-lite-client · GitHub". Github.com. Retrieved 2013-02-14.
- "devjones/PyEtherpadLite · GitHub". Github.com. Retrieved 2013-02-14.
- "jhollinger/ruby-etherpad-lite · GitHub". Github.com. Retrieved 2013-02-14.
- README.markdown. "tomassedovic/etherpad-lite-client-js · GitHub". Github.com. Retrieved 2013-02-14.
- "jhollinger/java-etherpad-lite · GitHub". Github.com. 2013-01-20. Retrieved 2013-02-14.
- "alexzautke/etherpad-lite-objc · GitHub". Github.com. Retrieved 2013-02-14.
- "Luc Didry / Etherpad-API-0.07 · MetaCPAN". metacpan.org. Retrieved 2013-03-13.
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