Second update is here with a whole bunch more stuff including the breaking up and addition of some categories to make things clearer.

There's still SO MUCH to be added, but the biggest, easiest chunks are all on. The document is 39 pages with a two-page intro, so nearly 37 pages of links and information.

Thank you to GrinningGrig for some of the recommendations!

Art

Free & PWYW Art

• Bandit Camp FREE STOCK ART: 128 Fantasy Monsters This is a collection of 128 different monsters for use with your fantasy products or in any fantasy game you want to run [CC-BY 4.0]
• Johansome - DURFJAM - Potion Cards Here are a few magical potions and vials for you to use and adapt in your tabletop games and adventures! [CC-BY-SA 4.0
• Kavross - Mouse Doodles Free spot art for your rodent rpg needs. Give me credit, or don't. I'm not your mom.
• misterG-gamedev - Cartoon Forest misterG welcome to this odd cartoon forest; a peaceful place, a quiet place - a place where you are safe to plan your next adventure ahead.
• Useum The Interactive Fine Art Gallery [This website sells NFTs. Fuck NFTs]

Subscriptions: Patreon, Ko-fi, etc.

• Oleg Dolya (Watabou) (£5/month) creating Medieval Fantasy City Generator and other procgen stuff
• Penzilla (£1+/month) Creating Game assets and more! 

Paid Art

• Steven Colling
  • Inked Adventure Items ($4.99+) A set of 126 hand-drawn items suitable for your commercial action adventures, roguelikes, role-playing, survival and crafting-related games.
  • Isle of Lore 2: Strategy Figures ($9.99+) is a set of 80 figures and 16 additional compositions*, spanning villagers, workers, fighters, monsters, animals and vehicles, ready for your strategy video game or tabletop RPG

Commissions

• Strega Wolf van den Berg

Map

Free & PWYW Maps

• M.A. GUAX - Unseen #1 Underground theme tiles for hex kit
• Michael LaBossiere - Mike's Free Maps Collections [Royalty Free]
• Ordinal M - Ordinal Simple Tiles for Hex Kit This is a pack of tiles for Hex Kit that I developed for use in my own games and am releasing for general use.
• Vickyradcliffe
• • Hex Tiles - Heightened Sensory Input Bright hexes and eclectic icons for use with the amazing Hex Kit
  • Hex Tiles - Old Skool Hand Drawn Simple colours and hand drawn icons to use with the amazing Hex Kit

Paid Maps

• Batts
• • Batts Analog Hex Kit Tileset ($5+) A tileset for Hex Kit.
  • Batts Digital Hex Kit Tileset ($5+) A tileset for Hex
• Cone Of Negative Energy
  • Hex Kit ($15+ ) is a multi-platform desktop application for building hex maps to be used with table top role playing games 
  • Hex Kit: Fantasyland ($7.50+) Fantasy themed tile set for Hex Kit
  • Hex Kit: Spaceland Part One; Space ($7.50+) Sci-Fi themed tiles for Hex Kit! 
  • Hex Kit: The Black Spot Tileset ($4.50+)  a tile set for the Hex Kit map making desktop application in the style of old world treasure maps
  • Hex Kit: Traveling Through Dangerous Scenery ($7.50+) Even more tiles for Hex Kit!
• Emmy 
  •  Space & Planetary Hexes ($5+) Space photography in hex form for use with Hex Kit
  • Space & Planetary Hexes ($5+) Space photography in hex form for use with Hex Kit

• Highland Paranormal Society Tiles Of Xark!, The ($5+) This is a small flat top tile set for Hex Kit. It launched with 50ish tiles and now has been updated to 170ish tiles [Maps created with this tile set can be used in commercial products.]
• Penzilla
  • Hand drawn isometric RPG village | Tile-set [royalty free] ($5+) This asset pack includes assets for building a wonderful little farming town, selling vegetables in the autumn. The pack includes buildings and décor items in three color variations; orange, green, and purple, with a variety of different vegetables and fruits. All assets are split up in layers, so a potential character can e.g. be placed behind a counter or inside a house.
  • Hand Drawn Map Assets | Tile-set [royalty free] ($2+) This asset pack includes HQ assets for creating fantasy medieval maps. The pack includes forests, mountains, villages, and more, and with a 93 piece tile-system for creating lands you can customize your world as much as you need!

• Steven Colling:

• Isle of Lore: Hex Tiles ($9.99+) is an asset pack containing hex tiles and icons as well as an island generator*. Use the assets in your private or commercial video games or print projects, for example as map illustrations in your tabletop RPG!
• Isle of Lore 2: Hex Tiles Regular ($9.99+) Set of hex tiles and icons for fantasy maps in your video game or print tabletop rpg! Compatible with both Hex Kit and the Tiled Editor
• Isle of Lore 2: Strategy Figures ($9.99+) is a set of 80 figures and 16 additional compositions*, spanning villagers, workers, fighters, monsters, animals and vehicles, ready for your strategy video game or tabletop RPG
• Terrain Icons ($4.99+) is a set of 20 cute icons in many variations, ready to use for your video game, tabletop rpg, print product or any other commercial endeavour

Fonts

Free & PWYW Fonts

• First Font (FontJam) by misterG-gamedev
• Free Pixel Fonts – Nico FontJam Pack 4 free pixel fonts styles (each with monospaced & fixed variants), plus 16+ bitmap font freebies by Emhuo
• Peaberry Pixel Font Free monospaced pixel font (custom spaced versions as well) by Emhuo 
• Polaris High-Rise Font Pack a pack of two Sci-Fi themed, monospaced, all-caps pixel fonts. Themed around semi-rounded shapes, nonstandard angles and line weight variations by Sunfire Interactive
• RaccoonSerif Pixel Font Free font pack with monospaced, proportional, bold, medium, and mini variants - plus styled bitmap font freebies by Emhuo 
• Zoom Zoom Truetype A janky scifi-ambience Truetype font by Caffeinated Otter

Paid Fonts

• Heavy Handed Font ($2+) A marker based font for funs by Ray Olsen
• Honeyblot Caps ($9.99) is a round, sans-serif, all-caps typeface based on my handwriting with an ink pen by Steven Colling
• Honey Pigeon ($19.99+)A clean and unobtrusive sans-serif font with rounded ends. It is best used for bodies of text at smaller sizes by Steven Colling

Icons & Logos

Free & PWYW Logo

• Antlers Antlers generator by watabou [You can use images created by the generator as you like]
• Sigil Generator Generates simple sigils and astrological symbols watabou [You can use images created by the generator as you like]

Paid Icons & Logos

• Hand drawn asset icons, RPG and Magic | Royalty Free ($6+) Beautiful hand drawn RPG assets and icons to add some magic to your project by Penzilla 
• Hand drawn asset icons, foods and vegetables ($8+) Beautiful hand drawn food assets and icons from around the world by Penzilla
• Isle of Lore 2: Status Icons($9.99+) is a set of 120 status icons covering all your commercial and non-commercial roleplay, rogue-like and survival video game needs by Steven Colling

Free & PWYW Software & Tools

• CoMiGo
  • CoMiGo's palette generator Complete stylized color grids for Palettes (Support: Ko-fi, Patreon)

• CoMiGo's Paper Sprite-o'matic Create and download printable grids for drawing, plotting, and tabletop games (Support: Ko-fi, Patreon)
• JSONBabel A tool for editing json-based translation files (Support: Ko-fi, Patreon)
• Papers on Demand! Create and download printable grids for drawing, plotting, and tabletop games (Support: Ko-fi, Patreon)

• GIMP A cross-platform image editor available for GNU/Linux, macOS, Windows and more operating systems. It is free software, you can change its source code and distribute your changes.
• Krita A professional FREE and open source painting program. It is made by artists that want to see affordable art tools for everyone (Support)
• Tiled Map Editor Tiled supports editing tile maps in various projections (orthogonal, isometric, hexagonal) and also supports building levels with freely positioned, rotated or scaled images or annotating them with objects of various shapes by Thorbjørn (Support: GitHub Sponsors, Patreon and Liberapay)

Repositories & Jams

• DMs Guild Creator Resource Art Directory curated by Trevor Salla, Adam Hancock [ONLY FOR DMs GUILD CREATIONS]
• FontJam Hosted by Speak the Sky
• Hex Jam Hosted by World Champ Game Co.
• So you wanna make a cool pamphlet, huh… This is a meta-pamphlet. In other words, a pamphlet about making pamphlets. It is totally free and you can thank me creating awesome pamphlets (or buying one of the paid pamphlets in my store). by Guilherme Gontijo