Karsha is Free Open Source Software that is licensed by the University of Maryland and the Lanka Software Foundation
OUTDATED Karsha: Document Annotation and Semantic Search (DASS)
Karsha DASS is a repository of financial documents that have been annotated using terms from the Financial Industry Business Ontology (FIBO). [Documents can also be annotated using other ontologies and/or thesauri.] We are developing a sample repository comprising a collection of bond prospectus (corporate and municipal bonds) and their supplements retrieved from EMMA 
Karsha constructs a Lucene  index of sections of the document (indexing the keywords within sentences). It uses Okapi cosine keyword based similarity to compare the sections (sentences) of the document with definitions for ontology terms and chooses/recommends the Top K terms. We focus on the FIBO since it provides an excellent set of definitions.
Potential use cases include the following: - Rank and retrieve documents using FIBO search terms. - Cluster documents to better understand the contents of a repository. - Compare pairs of documents for similarities as well as gaps or dis-similarity. - Karsha can be extended to include sentence understanding so that one can answer more refined questions such as 'which of these instruments is likely to be impacted by a fluctuation of XYZ'?
Architecture and Workflow
Karsha Annotate Source Code Karsha Source code is released under AGPL license and it's maintained at GitHub repository Pull a copy of source code from here
Karsha Document Annotation and Semantic Search (DASS) Dhananjeyan Balaretnaraja S. Jeyarasan Kasun Perera Amal Siriwardane Louiqa Raschid UMIACS Technical Report, 2012.