LexEVS featured a comprehensive Java implementation of the CTS2 Service Functional Model in it's preliminary form as a Draft Standard for Trial Use in LexEVS 6.0. The final specification of CTS2 was designed as a REST specific API and LexEVS 6.1 has implemented the specification core functionality.
The current state of CTS2 as implemented in LexEVS 6.1 is outlined in a CTS2 implementation resources site.
The full CTS2 specification is hosted by the OMG group.
The full CTS2 Service Functional Model as normalized to the OMG group is hosted here.