Their website[1] hints at the language at being either "COBOL" or "NATURAL": "NDIT is maintaining several customer systems that were written in the COBOL progr

Their website[1] hints at the language at being either "COBOL" or "NATURAL": "NDIT is maintaining several customer systems that were written in the COBOL programming language. These are batch and on-line applications that run on our mainframe computer. Our direction is to phase out COBOL programs as systems are re-written in newer technologies." "NATURAL is a fourth-generation programming language that NDIT runs on our mainframe computer and Linux environment. NATURAL applications can run in batch or on-line mode. Our direction is to phase out NATURAL programs as systems are re-written in newer technologies." Edit (Additional Note): The University of Latvia seems to create content about both[2]. [1] https://www.nd.gov/itd/services/application-development https://www.nd.gov/itd/services/application-development [2] http://dspace.lu.lv/dspace/handle/7/15258 http://dspace.lu.lv/dspace/handle/7/15258