BigCouch, an open-source version of Apache CouchDB which was maintained by Cloudant, was merged with the CoudDB project in 2013.
BigCouch is an open-source, highly available, fault-tolerant, clustered & API-compliant version of Apache CouchDB, which was maintained by Cloudant. The merge was completed in July 2013. On January 5, 2012, Cloudant announced they would contribute the BigCouch horizontal scaling framework into the CouchDB project. 
