The best alternatives to AR Grimoire are RPGen, Dungeon Mastery, and Magic: The Gathering. If these 3 options don't work for you, we've listed a few more alternatives below.
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Good Dungeon Masters have a lot of notes. But the longer your TTRPG campaign goes on, the harder it is to find the details for everything that's happened! Dungeon Mastery's cross-linked notes are the glue that binds your book of lore together.