MassCat is an online resource sharing network for school, special, and small public libraries in Massachusetts. MassCat was created in 2001 and has been a service of the Massachusetts Library System (MLS) since 2010.
MassCat uses the web-based Koha ILS to offer circulation, inter-library loan, cataloging, acquisitions, and serials management. The Koha ILS (integrated library system)
is an open source software used by libraries internationally.