There are some collections of tables which stand alone. Brimming with ideas to help the novice game master, world builder or adventure writer.
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The Tome of Adventure Design from Frog God Games has been mentioned by a few of the creators I've interviewed. It has a multitude of tables focused at developing an adventure, split into sections (or "books") around Principles and Starting Points, Monsters, Dungeon Design and Non-Dungeon Adventure Design.
GM Gems from Goodman Games is System Neutral and contains 80 pages of d100 random tables split into three broad sections. These are The Urban Experience, Getting There is Half the Fun and The Dungeon.
Ultimate Toolbox from AEG is one that I have a soft spot for as it got me using more random tables in my games and has inspired several generators. It is a grand sprawling collection of d20 tables across 7 chapters. These are Character; World; Civilization; Maritime; Dungeon; Magic and Plot plus an appendix of name and other tables.
GM's Miscellany: the Thingonomicon is from Raging Swan Press has pdf and book versions. It contains many lists grouped around 26 themes such as "Bustling Marketplace", "Looting the Body", "Smugglers' Lair" and "Wilderness Camping"
The Gamemaster Codex is for use with D&D 5e with sections containing rules summaries and advice on areas on the games. Although smaller than other tomes, each page is packed with tables, from hit locations to chases, to treasure, locations and combat encounters.
Fantasy Tome of Lists (2nd Edition) from JEN Games has options for pdf, softcover and hardcover. It is very reasonably priced and lists all of the tables in the Table of Contents in the Previews. Many tables are the familiar d20, d100 and d12 but others are unusual such as d44, d50 and d88.
It has a sequel in Fantasy Tome of Lists 2
This is actually three tomes from Goodman Games.
Each has a small preview
The Books of Random Tables from dicegeeks are collections of unrelated d100 tables covering a number of genres.
The Book of Random Tables is the first and Fantasy, with notable tables being Items in an Alchemist's Lab, Items on a Dead Goblin, Medicinal Herbs and Seafaring Encounters. It has companions Book of Random Tables Two, Book of Random Tables Three and Book of Random Tables Four
Some gamers love unusual dice and these service the d50 (or d100 halved) and the d30.
50 Fantastic Functions for the D50 has tables covering a myriad of areas. From planet systems to NPC motivations, through assassins, poisons and eldritch gateways, onto pictures of faces in a crowd and dungeon doors.
The d30 DM Companion is designed with OSR (Old-School Revival) games in mind using the rare 30-sided die (or d30). It has many compact tables for dungeons, encounters, quick character creation, traps, treasure and magic items.
d30 Sandbox Companion also is focused more on running a sandbox campaign, with some tables using OSR terms. Also using the d30, it covers outdoor environments, travel, location generators, adventure creation, settlements, NPCs and fast mapping.
Your Random Table PDF Recommendations
I'll keep this guide updated so please suggest more random table pdfs in the comments or on my Discord server