The Great Net Prayerbook (GNPB), like The Great Net Spellbook is a fan-made compilation and collection of cleric spells for Advanced Dungeons & Dragons (2nd Edition).
The book was originally a collection of homemade clerical spells collected from the Usenet group rec.games.frp.dnd. However, as time progressed and the world-wide web became more popular, spells were submitted and collected from a wide variety of places.
The GNPB has gone through 6 editions, each one being thoroughly checked for licensing and copyright validations and each edition adding its own unique. The last edition came out in 1995 with over 1800 spells available for use.