Etherpad
Etherpad (previously known as EtherPad) is an open-source, 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 colour. There is also a chat box in the sidebar to allow meta communication.
There are many openly accessible Etherpad installations for you to choose as the following list from the Etherpad.org website shows. All links will open in new tabs:
SSL Enabled (Secure Data Transfer)
· https://board.net (including the following modules: upload and paste images, headlines, run as slideshow, comment, markdown, line numbers, show author on hover) run by NGO fairkom.eu as part of fairapps in Austria
· https://pad.riseup.net/ (Tor exit enclave and hidden service, pads removed after 30 days of inactivity)
· https://demo.sandstorm.io/ (Sandstorm demo server — pads removed after 1 hour) or run Etherpad on your own Sandstorm server
· https://framapad.org/ (run by french NGO Framasoft member of CHATONS)
· https://pad.picasoft.net/ (run by french NGO Picasoft member of CHATONS)
· https://pad.infini.fr/ (run by french NGO Infini member of CHATONS)
· https://pad.ouvaton.coop/ (pads removed after 400 days of inactivity)
· https://pad.systemli.org/ (pads removed after 30 days of inactivity)
· https://pad.lqdn.fr/ (run by French NGO La Quadrature du Net)
· https://public.etherpad-mozilla.org/ (requires login)
· https://pad.hashtagueule.fr/ (run by independent French blog Hashtagueule.fr team)
· https://pad.aquilenet.fr (French non profit ISP member of FFDN.org)
· https://demo.maadix.org/etherpad/ (Installation includes the ep_maadix plugin https://github.com/MaadixNet/ep_maadix which allows to create private groups and invite users, assigning them different roles)
· https://yopad.eu (run by German Federal Youth Council DBJR)
· https://pad.pedeagua.org/ (run by brazillian NGO Caminho das Águas)
· https://etherpad.devol.it (run by italian NGO devol)
· https://coropad.lou.quebec (run by independent developer in Montréal, Québec, Canada)
· https://pad.education (run by France Université Numérique)