Wikidocs is a collaborative HTML editing API and platform. You can easily (3 lines of code) enable users of your application to collaborate simultaneously in real time any HTML document.
It's like Google docs for HTML.
The technology is globally unique. While other technology leaders say, operational transformation (OT) is difficult if not impossible for HTML, we solved that problem (http://www.waveprotocol.org/faq). Wikidocs enables you providing collaboration tools to make your applications real time collaborative. Every user sees the changes of other users in real time as they happen. The technology is applicable to any HTML document like notes, docs, spreadsheet, presentations and others.