ANSI Standard MUMPS
Implementation of ANSI Standard MUMPS 1995 and ISO/IEC 11756 for FreeBSD, OSX and linux. Also on the Raspberry Pi (ARM) under debian and Windows under cygwin. This is the post-relational database.
Since 1978 or so, VistA FileMan (aka File Manager) has been the database management system of the VistA (Veterans Health Information Systems and technology Architecture) medical software system created by the U.S. Department of Veterans Affairs.
Hardhats is dedicated to fostering a virtual community for the worldwide users of the VISTA (DHCP) software. This sofware is available directly to the public under the Freedom of Information Act.