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Author of ShareDB (https://github.com/share/sharedb) here. ShareDB is a stable production JSON OT system that powers the entire backend for Lever (https://www.lever.co/). All of Lever's apps, backend services, migration scripts, etc. go through ShareDB. It scales horizontally; over 1000 companies use Lever, including companies with 1000s of employees, like Netflix and Yelp.

There are some simple examples in the repo to get you started. Please let us know if you have any questions getting going!

We do OT on HTML (or rather the DOM) in the Webstrates (http://www.webstrates.net) project. We use ShareJS (now ShareDB) and represent and store the DOM as a JSON document.

I'm looking for a good 3-way merge for strings implemented in Javascript.