PMON is a freeware ROM-monitor developed for early LSI Logic MIPS R3000 evaluation boards. Since its creation, PMON has become a very common firmware for MIPS evaluation boards and development systems.
Phil Bunce's, the PMON designer used to have a website at http://www.carmel.com/pmon which seems to have become unavailable, but still is archived at http://web.archive.org/www.carmel.com/pmon/ .
The PMON code base is rather old now, supports relatively few boards and is not being actively worked on by a single project team. PMON 2000 has become the inofficial successor of PMON.