Etherpad is a highly customizable Open Source online editor providing collaborative editing in really real-time. Etherpad allows you to edit documents collaboratively in real-time, much like a live multi-player editor that runs in your browser. Write articles, press releases, to-do lists, etc.
OS: Windows, Mac, Linux.
EtherCalc is a web spreadsheet. Data is saved on the web, and people can edit the same document at the same time. Changes are instantly reflected on all screens. Work together on inventories, survey forms, list management, brainstorming sessions..
OS: Windows, Mac, GNU/Linux, FreeBSD, Browser.
ProtectedText is an open source web application. It encrypts and decrypts text in the browser, and password (or its hash) is never sent to the server – so that text can’t be decrypted even if requested by authorities. No cookies, no sessions, no registration, no users tracking.
OS: All Browsers.