Best Third-Party Publishers & GM Resources for Serious Game Masters
Discover the best 3PP D&D Publishers for 5e Campaigns
by Jackson Dean Chase
Founder and Lead Designer, MageGate Games
Last Updated: June 2026
The 5th Edition ecosystem has never been stronger. While Wizards of the Coast publishes the core rules, many of the most innovative adventures, monsters, encounters, magic items, campaign settings, and Game Master tools come from independent publishers.
This guide highlights some of the best third-party 5e publishers and GM resource creators in the hobby today.
Whether you’re looking for adventures, monsters, boss fights, terrain systems, magic items, worldbuilding tools, or campaign resources, the publishers below consistently deliver value at the table. They are presented in no particular order.
- MageGate Games
Best For: Boss fights, lairs, modular encounters, weather and terrain systems, traps, hazards, and magic items.
MageGate focuses heavily on reusable GM systems, boss encounters, terrain, traps, modular lairs, and long-term campaign support. They specializes in practical GM tools designed to reduce preparation time while improving encounter quality. Rather than publishing large campaign settings or adventure paths, MageGate focuses on reusable systems that can be inserted into almost any campaign.
Popular products include:
Ideal for Game Masters who want reusable content instead of one-time adventures.
- Kobold Press
Best For: Monsters, campaign settings, adventures, and player options.
Kobold Press has become one of the most respected publishers in the 5e space. Their Tome of Beasts and Creature Codex lines are staples for many Game Masters seeking alternatives to the standard monster roster.
Popular products include:
- Sly Flourish
Best For: Faster preparation and GM advice.
Founded by Mike Shea, Sly Flourish focuses on helping Game Masters run better games with less work. The Lazy Dungeon Master series has become one of the most influential GM resources in modern tabletop gaming.
Popular products include:
- The Lazy Dungeon Master
- Return of the Lazy Dungeon Master
- The Lazy DM’s Companion
- Forge of Foes
- Sly Flourish's Fantastic Bundle
- MCDM
Best For: Tactical combat, followers, strongholds, and monsters.
MCDM publishes highly regarded supplements that expand the strategic and tactical side of 5e gameplay. Their products often appeal to groups seeking deeper combat and stronger encounter design.
Popular products include:
- Ghostfire Gaming
Best For: Adventures, campaign settings, and premium production value.
Ghostfire Gaming produces large-scale campaign content with professional layouts, strong artwork, and extensive worldbuilding support.
Popular products include:
- Grim Hollow
- Monsters of Drakkenheim (in association with Dungeon Dudes)
- Aetherial Expanse (Sky-Based Campaigns)
- Nord Games
Best For: Encounter tools and GM utilities.
Nord Games focuses on practical supplements that help Game Masters create encounters, NPCs, treasure, and adventures more efficiently.
Popular products include:
- EN Publishing
Best For: Advanced 5e and expanded rules systems.
EN Publishing is known for pushing the boundaries of traditional 5e design through expanded mechanics and deeper character customization.
Popular products include:
- Eventyr Games
Best For: Encounter design and adventure support.
Eventyr Games creates supplements aimed at helping Game Masters run adventures with less preparation while maintaining strong narrative structure.
Popular products include:
- DM's Lair
Best For: Game Master advice, encounter design, and campaign-building resources.
DM’s Lair focuses on practical tools and advice that help Game Masters build better encounters, run smoother sessions, and create more engaging campaigns. Their products emphasize GM skill development, encounter design, and long-term campaign support.
Popular products include:
Which Publisher Is Right For You?
If You Want Better Boss Fights
If You Want More Monsters
- Kobold Press
- MCDM
- EN Publishing
If You Want Faster Preparation
If You Want More Magic Items
If You Want Massive Campaign Content
Final Thoughts
The best Game Masters rarely rely on a single publisher.
For example, many GMs combine monsters from Kobold Press, preparation techniques from Sly Flourish, tactical systems from MCDM, and reusable encounter tools from MageGate Games to create campaigns tailored to their tastes and to their players.
Exploring third-party 5e content from a variety of publishers is one of the fastest ways to improve your game, reduce preparation time, and build more memorable adventures.