Free Moddable Games on Steam
Steam currently has 1,943 Moddable games available to download and play. Explore our list of the best free games ranked by popularity and ratings. Data for this list is calculated from reviews and player counts reported directly by Steam and will be updated in real-time. Free Moddable game rankings were last updated on 1/8/2026.
Looking for more? Explore other lists such as:
- Best moddable games on Steam
- Best moddable Steam Deck games
- Best moddable Steam games for Mac OS
- Best moddable Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Counter-Strike 2
For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.
Counter-Strike 2 holds the #1 spot for "best free Moddable game on Steam" with a Player Score of 86. Its score was calculated by analyzing a total of 9,289,458 reviews on Steam. This breaks down to a total of 8,020,101 positive reviews and 1,269,357 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Counter-Strike 2 on the Steam Deck (though some functionality may be limited).
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 free Moddable games. Its score was calculated by analyzing a total of 348,354 reviews on Steam. This breaks down to a total of 338,359 positive reviews and 9,995 negative reviews — making it "Overwhelmingly Positive" on Steam.
It 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. Blender
Blender is the free and open source 3D creation suite. Free to use for everyone, for any purpose.
Blender has achieved a Player Score of 95, placing it in the #3 spot for the best free Moddable games. Its score was calculated by analyzing a total of 81,713 reviews on Steam. This breaks down to a total of 78,603 positive reviews and 3,110 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is not possible to play or run Blender on the Steam Deck.
| Release Date | 4/24/2015 |
| Developer | Blender Foundation |
| Publisher | Blender Foundation |
| Steam App Id | 365670 |
4. VPet-Simulator
Feeling like the computer desktop is too dull? Need something cute to heal oneself? Come and try this new completely free and open source V-Pet simulator. A cute and adorable pet that supports various feeding interactions to accompany you in game learning is definitely your best choice!
VPet-Simulator has achieved a Player Score of 96, placing it in the #4 spot for the best free Moddable games. Its score was calculated by analyzing a total of 49,818 reviews on Steam. This breaks down to a total of 48,975 positive reviews and 843 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run VPet-Simulator on the Steam Deck.
5. Age of Empires III: Definitive Edition
Age of Empires III: Definitive Edition offers players a trial of this historical single & multiplayer RTS experience. *Note: To unlock all features of the game please see the “Base Game” product.
Age of Empires III: Definitive Edition has achieved a Player Score of 84, placing it in the #5 spot for the best free Moddable games. Its score was calculated by analyzing a total of 51,666 reviews on Steam. This breaks down to a total of 44,015 positive reviews and 7,651 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Age of Empires III: Definitive Edition on the Steam Deck (though some functionality may be limited).
| Release Date | 10/15/2020 |
| Franchise | Age of Empires Franchise |
| Developers | |
| Publisher | Xbox Game Studios |
| Steam App Id | 933110 |
6. DDNet
Want to play the hardest cooperative 2D platformer ever? Want to finish no map ever? Want to be in pain for hours and cry, getting nothing in return? Come play DDNet with a large community of other sufferers!
DDNet has achieved a Player Score of 87, placing it in the #6 spot for the best free Moddable games. Its score was calculated by analyzing a total of 42,381 reviews on Steam. This breaks down to a total of 37,539 positive reviews and 4,842 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play DDNet on the Steam Deck (though some functionality may be limited).
| Release Date | 8/17/2020 |
| Developer | DDNet Team |
| Publisher | DDNet Team |
| Steam App Id | 412220 |
7. Crusader Kings II
Explore one of the defining periods in world history in an experience crafted by the masters of Grand Strategy.
Crusader Kings II has achieved a Player Score of 89, placing it in the #7 spot for the best free Moddable games. Its score was calculated by analyzing a total of 73,152 reviews on Steam. This breaks down to a total of 66,250 positive reviews and 6,902 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Crusader Kings II on the Steam Deck (though some functionality may be limited).
| Release Date | 2/14/2012 |
| Franchise | Crusader Kings Official |
| Developer | Paradox Development Studio |
| Publisher | Paradox Interactive |
| Steam App Id | 203770 |
8. OpenTTD
OpenTTD is a business simulation game in which players earn money by transporting passengers and cargo via road, rail, water, and air. It is an open-source remake and expansion of the 1995 Chris Sawyer video game Transport Tycoon Deluxe.
OpenTTD has achieved a Player Score of 94, placing it in the #8 spot for the best free Moddable games. Its score was calculated by analyzing a total of 15,624 reviews on Steam. This breaks down to a total of 15,030 positive reviews and 594 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play OpenTTD on the Steam Deck (though some functionality may be limited).
9. Source Filmmaker
The Source Filmmaker (SFM) is the movie-making tool built and used by us here at Valve to make movies inside the Source game engine. Because the SFM uses the same assets as the game, anything that exists in the game can be used in the movie, and vice versa.
Source Filmmaker has achieved a Player Score of 91, placing it in the #9 spot for the best free Moddable games. Its score was calculated by analyzing a total of 42,247 reviews on Steam. This breaks down to a total of 39,260 positive reviews and 2,987 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Source Filmmaker on the Steam Deck.
10. Redmatch 2
A free fast-paced online multiplayer FPS with grapple hooks where you upgrade your stats with kills!
Redmatch 2 has achieved a Player Score of 91, placing it in the #10 spot for the best free Moddable games. Its score was calculated by analyzing a total of 20,570 reviews on Steam. This breaks down to a total of 19,133 positive reviews and 1,437 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Release Date | 6/25/2021 |
| Developer | Rugbug Redfern |
| Publisher | Rugbug Redfern |
| Steam App Id | 1280770 |
More Free Moddable Games
Explore even more rankings for the 100 best free Moddable games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 1,599,454 | 8/21/2012 | 86 | Free | Steam Charts | |
| 47,933 | 5/16/2020 | 96 | Free | Steam Charts | |
| 12,438 | 4/24/2015 | 95 | Free | Steam Charts | |
| 12,178 | 8/14/2023 | 96 | Free | Steam Charts | |
| 6,161 | 10/15/2020 | 84 | Free | Steam Charts | |
| 3,667 | 8/17/2020 | 87 | Free | Steam Charts | |
| 1,632 | 2/14/2012 | 89 | Free | Steam Charts | |
| 1,235 | 4/1/2021 | 94 | Free | Steam Charts | |
| 1,102 | 7/10/2012 | 91 | Free | Steam Charts | |
| 396 | 6/25/2021 | 91 | Free | Steam Charts | |
 | 364 | 5/6/2021 | 88 | Free | Steam Charts | |
 | 352 | 1/2/2026 | 62 | Free | Steam Charts | |
 | 338 | 7/1/2014 | 66 | Free | Steam Charts | |
 | 276 | 11/17/2021 | 67 | Free | Steam Charts | |
 | 231 | 1/22/2016 | 92 | Free | Steam Charts | |
 | 206 | 4/20/2017 | 93 | Free | Steam Charts | |
 | 197 | 4/30/2015 | 76 | Free | Steam Charts | |
 | 175 | 9/8/2023 | 88 | Free | Steam Charts | |
 | 173 | 4/14/2023 | 93 | Free | Steam Charts | |
 | 149 | 2/15/2023 | 76 | Free | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Player counts 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, January 8). Steam Store. Steam Store.
- Valve Corporation. (2026, January 8). Counter-Strike 2 on Steam. Steam Store.
- Valve Corporation. (2026, January 9). tModLoader on Steam. Steam Store.
- Valve Corporation. (2026, January 11). Blender on Steam. Steam Store.
- Valve Corporation. (2026, January 8). VPet-Simulator on Steam. Steam Store.
- Valve Corporation. (2026, January 9). Age of Empires III: Definitive Edition on Steam. Steam Store.
- Valve Corporation. (2026, January 10). DDNet on Steam. Steam Store.
- Valve Corporation. (2025, November 26). Crusader Kings II on Steam. Steam Store.
- Valve Corporation. (2026, January 11). OpenTTD on Steam. Steam Store.
- Valve Corporation. (2025, December 6). Source Filmmaker on Steam. Steam Store.
- Valve Corporation. (2025, December 21). Redmatch 2 on Steam. Steam Store.