Tango: Distributed Data Structures Over a Shared Log

The paper is available for access for free - http://dl.acm.org/citation.cfm?id=2522732

Anyone can implement the paper and then open source that - from the way the article is worded there might not be a stable/production ready version of Tango in the wild yet.

There are lots of open source implementations of similar ideas. Check out anything based on Raft: etcd, for example.

I also wrote some blog postings applying the idea to a bunch of different systems: http://blog.justinsb.com/blog/categories/cloudata/