LexEVS is the central EVS terminology server, developed by the Mayo Clinic with NCI and other support. NCI LexEVS provides a common terminology model and open access to a wide range of terminologies, terminology value sets, and cross-terminology mappings needed by NCI and its partners. NCI's servers are very widely used within NCI and throughout the biomedical community, and the open source LexEVS server software has been deployed at a number of other sites (refer to EVS Use and Collaborations).
LexEVS 6.0 was based on the draft standard Common Terminology Services Release 2 (CTS 2) specification. While further development at NCI is on hold, 6.0 provides the core CTS 2 functionality important to most users, including Administration, Search and Query, Mapping Support, Value Set Support and Authoring and Maintenance. Priorities for a possible 6.1 development effort include enhanced REST and SOAP interfaces.
Refer to the LexEVS wiki for detailed information including documentation, development documents, and support.