Karma is a popular and useful tool for data ingestion in VIVO – particularly for mapping relational data to RDF. Violeta Ilik of Adelphi University has done a lot of work with Karma for VIVO and has put together YouTube videos of the mapping process. The following page contains detailed information about the mapping process: Using the Karma data integration tool.
Karma itself can be downloaded and installed using these instructions:
The Karma transformation models used at Northwestern are also on Github.