Best Mod Games on Steam (for Mac OS)
Steam currently has 241 Mod games, but not all of them are able to be played on Mac. Explore our list of the best picks ranked by Player Score. Our Player Score rankings are calculated directly from reviews left on the Steam store and will be updated in real-time as more players leave their feedback. Mod game rankings were last updated on 2/23/2026.
Looking for more? Explore other lists such as:
- Best mod games on Steam
- Best mod Steam Deck games
- Best mod Linux games on Steam
- Free mod games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Garry's Mod
Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.
Garry's Mod holds the #1 spot for "best Mac OS Mod game on Steam" with a Player Score of 96. Its score was calculated by analyzing a total of 1,217,934 reviews on Steam. This breaks down to a total of 1,179,527 positive reviews and 38,407 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $4.99 to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Garry's Mod on the Steam Deck (though some functionality may be limited).
| Steam Price | $4.99 |
| Release Date | 11/29/2006 |
| Developer | Facepunch Studios |
| Publisher | Valve |
| Steam App Id | 4000 |
2. tModLoader
Dig, Fight, and Build your way through the world of player-created mods on Terraria with tModLoader - this DLC makes modding Terraria a reality!
tModLoader has achieved a Player Score of 96, placing it in the #2 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 357,067 reviews on Steam. This breaks down to a total of 346,823 positive reviews and 10,244 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is completely free to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play tModLoader on the Steam Deck (though some functionality may be limited).
3. Portal Stories: Mel
Portal Stories: Mel is a community made, free modification for Portal 2 based in the Portal universe. It tells the story of Mel, who meets a new personality core and faces an undiscovered threat to the Aperture facility.
Portal Stories: Mel has achieved a Player Score of 94, placing it in the #3 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 23,336 reviews on Steam. This breaks down to a total of 22,410 positive reviews and 926 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is completely free to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Portal Stories: Mel on the Steam Deck (though some functionality may be limited).
| Release Date | 6/25/2015 |
| Developer | Prism Game Studios Ltd. |
| Publisher | Prism Game Studios Ltd. |
| Steam App Id | 317400 |
4. Portal Reloaded
Portal Reloaded is a free, community made modification for Portal 2. The mod builds on the concepts of the main game by allowing you to place a third portal, which enables traveling between two different timelines. Thinking in four dimensions is vital to solving 25 brand new mind-bending puzzles.
Portal Reloaded has achieved a Player Score of 94, placing it in the #4 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 21,726 reviews on Steam. This breaks down to a total of 20,872 positive reviews and 854 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is completely free to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Portal Reloaded on the Steam Deck (though some functionality may be limited).
5. Rusted Warfare - RTS
{{An RTS inspired by the classics of the past!}} Making up for it's subpar retro graphics with fun gameplay and modern multi-threaded tech enabling huge battles to run smooth... Featuring singleplayer challenges, skirmish, sandbox, 10-player multiplayer & workshop modding.
Rusted Warfare - RTS has achieved a Player Score of 93, placing it in the #5 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 6,958 reviews on Steam. This breaks down to a total of 6,707 positive reviews and 251 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $4.99 to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Rusted Warfare - RTS on the Steam Deck (though some functionality may be limited).
| Steam Price | $4.99 |
| Release Date | 7/14/2017 |
| Developer | Corroding Games |
| Publisher | Corroding Games |
| Steam App Id | 647960 |
6. Cities: Skylines
Cities: Skylines is a modern take on the classic city simulation. The game introduces new game play elements to realize the thrill and hardships of creating and maintaining a real city whilst expanding on some well-established tropes of the city building experience.
Cities: Skylines has achieved a Player Score of 92, placing it in the #6 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 283,908 reviews on Steam. This breaks down to a total of 263,975 positive reviews and 19,933 negative reviews — making it "Very Positive" on Steam.
It is priced at $29.99 to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Cities: Skylines on the Steam Deck (though some functionality may be limited).
| Steam Price | $29.99 |
| Release Date | 3/10/2015 |
| Developers | |
| Publisher | Paradox Interactive |
| Steam App Id | 255710 |
7. Half-Life 2: Update
A completely free and extensive community-developed update for Half-Life 2 featuring beautiful lighting, countless bug fixes, and a brand new Community Commentary Mode. With Half-Life 2: Update, there’s never been a better time to revisit City 17.
Half-Life 2: Update has achieved a Player Score of 91, placing it in the #7 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 8,525 reviews on Steam. This breaks down to a total of 7,969 positive reviews and 556 negative reviews — making it "Very Positive" on Steam.
It is completely free to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Half-Life 2: Update on the Steam Deck (though some functionality may be limited).
| Release Date | 3/27/2015 |
| Developers | |
| Publisher | Filip Victor |
| Steam App Id | 290930 |
8. Estranged: Act I
Estranged tells the story of a lone fisherman, whose ship is stranded on a mysterious island during a violent storm. Explore the rich environments and meet the curious inhabitants of the island as you find a way back to the mainland.
Estranged: Act I has achieved a Player Score of 90, placing it in the #8 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 7,187 reviews on Steam. This breaks down to a total of 6,714 positive reviews and 473 negative reviews — making it "Very Positive" on Steam.
It is completely free to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Estranged: Act I on the Steam Deck (though some functionality may be limited).
| Release Date | 1/16/2014 |
| Franchise | Estranged Franchise |
| Developer | Alan Edwardes |
| Publisher | Alan Edwardes |
| Steam App Id | 261820 |
9. Farming Simulator 15
Welcome to the new generation of Farming Simulator!With a brand new graphics and physics engine, Farming Simulator 15 offers an immense open world, filled with details and visual effects transporting the Farming Simulator franchise to a new era.
Farming Simulator 15 has achieved a Player Score of 90, placing it in the #9 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 15,658 reviews on Steam. This breaks down to a total of 14,470 positive reviews and 1,188 negative reviews — making it "Very Positive" on Steam.
It is priced at $12.99 to play and can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Farming Simulator 15 on the Steam Deck (though some functionality may be limited).
| Steam Price | $12.99 |
| Release Date | 10/30/2014 |
| Franchise | Farming Simulator Franchise |
| Developer | Giants Software |
| Publisher | Giants Software |
| Steam App Id | 313160 |
10. Car Mechanic Simulator 2015
New cars, new tools, new options, more parts and much more fun in the next version of Car Mechanic Simulator! Take your wrench! Create and expand your auto repairs service empire. Car Mechanic Simulator 2015 will take you behind the scenes of daily routine in car workshop.
Car Mechanic Simulator 2015 has achieved a Player Score of 90, placing it in the #10 spot for the best Mac OS Mod games. Its score was calculated by analyzing a total of 14,612 reviews on Steam. This breaks down to a total of 13,499 positive reviews and 1,113 negative reviews — making it "Very Positive" on Steam.
It is priced at $19.99 to play and can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Car Mechanic Simulator 2015 on the Steam Deck (though some functionality may be limited).
| Steam Price | $19.99 |
| Release Date | 4/23/2015 |
| Developer | Red Dot Games |
| Publishers | |
| Steam App Id | 320300 |
More Mod Mac Games on Steam
Explore even more rankings for the 10 best Mod games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 17,150 | 11/29/2006 | 96 | $4.99 | Steam Charts | |
| 32,446 | 5/16/2020 | 96 | Free | Steam Charts | |
| 29 | 6/25/2015 | 94 | Free | Steam Charts | |
| 42 | 4/19/2021 | 94 | Free | Steam Charts | |
| 106 | 7/14/2017 | 93 | $4.99 | Steam Charts | |
| 6,413 | 3/10/2015 | 92 | $29.99 | Steam Charts | |
| 62 | 3/27/2015 | 91 | Free | Steam Charts | |
| 3 | 1/16/2014 | 90 | Free | Steam Charts | |
| 88 | 10/30/2014 | 90 | $12.99 | Steam Charts | |
| 14 | 4/23/2015 | 90 | $19.99 | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Reviews and rankings are enriched, analyzed, and updated in real-time to ensure we surface the most up-to-date insights. Learn more about the Steambase approach to data collection and our review methodology.
- Valve Corporation. (2026, February 23). Steam Store. Steam Store.
- Valve Corporation. (2026, February 23). Garry's Mod on Steam. Steam Store.
- Valve Corporation. (2026, February 12). tModLoader on Steam. Steam Store.
- Valve Corporation. (2025, October 9). Portal Stories: Mel on Steam. Steam Store.
- Valve Corporation. (2026, January 11). Portal Reloaded on Steam. Steam Store.
- Valve Corporation. (2025, December 15). Rusted Warfare - RTS on Steam. Steam Store.
- Valve Corporation. (2026, February 23). Cities: Skylines on Steam. Steam Store.
- Valve Corporation. (2025, December 18). Half-Life 2: Update on Steam. Steam Store.
- Valve Corporation. (2025, December 28). Estranged: Act I on Steam. Steam Store.
- Valve Corporation. (2025, November 27). Farming Simulator 15 on Steam. Steam Store.
- Valve Corporation. (2026, February 3). Car Mechanic Simulator 2015 on Steam. Steam Store.