Printable Graph Paper — A huge variety of graph, hex, dot, and isometric paper you can download and print.
Dungeon Scrawl — RPG‑friendly printable grids and mapping sheets.
Notes & Writing Apps
Notion — A versatile notes and organization app I use for organizing gamebook content.
Milanote — A visual notes app I use for organizing ideas and game design notes.
This is my referral link — it gives me a little extra storage if you sign up. But if you prefer, here is a non‑referral link.