BigCouch, an open-source version of Apache CouchDB which relies on Erland and the Verizon Telecom Platform and is 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. On January 5, 2012, Cloudant announced they would contribute the BigCouch horizontal scaling framework into the CouchDB project. The merge was completed in July 2013. It relies on Erlang and the Open Telecom Platform, despite using its own RPC mechanism over OTP's own "rex" server. 
