Some time ago, a reddit user asked: "what would you put in your GM binder?". Here's my list:
Ask the Stars, an oracle: https://www.bastionland.com/2020/12/ask-stars-minimal-solo-rpg.html?m=0
My own tables for hexcrawl building, and the articles and tables linked within: https://drive.google.com/drive/folders/1sdwPOWSrtMndwp4vf_bqtnP1X674hk5w
Points of interest d6: 1. Lair; 2. Dungeon; 3. Landmark; 4. Settlement; 5. Secret; 6. Loot
Landmarks: https://www.dragonsfoot.org/forums/viewtopic.php?f=1&t=59911
More landmarks/encounter vignettes: https://docs.google.com/file/d/1odvwxifgGvbeaInMChL5zzAPmtp_QsQo/view
Why is your replacement PC in the dungeon?: https://coinsandscrolls.blogspot.com/2017/03/osr-table-of-replacement-pcs.html
Running out of light in a dungeon/time to end the open table session: https://riseupcomus.blogspot.com/2019/04/you-are-likely-to-be-eaten-by-grue.html
The "catching up with the party" table in Macchiato Monsters, for players joining an ongoing adventure
Weather tables