From the post:
Karma is a web based tool that run both the server and browser right on your own machine so we had computers with the tool installed to play with.
Karma is an open source tool that makes it easy to convert data from a variety of formats into Linked Data.
Users load into Karma the ontologies for their application and data samples of each of the data files to be converted. Karma makes the conversion process easy as it provides an intuitive graphical user interface to visualize and edit the mapping of data files to ontologies; Karma is flexible as it can import data from a wide variety of data formats (SQL, XML, JSON, CSV, Excel, AVRO, Web-Services) … Karma scales to very large dataset (40 million documents, 1 billion triples) and can refresh periodically (e.g., every hour); Karma is a free, open source tool.