OPNFV is a platform. It is an integrated system of components that individually make up streams of projects which when combined together provide a platform upon which VNFs can be run. http://openbaton.github.io/ is a practical implementation for an open source NFVO. If one can get a vMME, vSGW, vPGW and vHSS (together being a vEPC) working together then the product is an NFV Lab.
Some of the attempts can be listed as: