Free Moddable Games on Steam
Steam currently has 2,003 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 3/13/2026.
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 9,460,972 reviews on Steam. This breaks down to a total of 8,164,399 positive reviews and 1,296,573 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 360,186 reviews on Steam. This breaks down to a total of 349,842 positive reviews and 10,344 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 84,186 reviews on Steam. This breaks down to a total of 80,944 positive reviews and 3,242 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 50,370 reviews on Steam. This breaks down to a total of 49,518 positive reviews and 852 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 52,473 reviews on Steam. This breaks down to a total of 44,779 positive reviews and 7,694 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 43,746 reviews on Steam. This breaks down to a total of 38,659 positive reviews and 5,087 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 73,387 reviews on Steam. This breaks down to a total of 66,462 positive reviews and 6,925 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. 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 #8 spot for the best free Moddable games. Its score was calculated by analyzing a total of 42,717 reviews on Steam. This breaks down to a total of 39,688 positive reviews and 3,029 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.
9. Team Fortress 2 Classified
Team Fortress 2 Classified is a new Team Fortress 2 experience built on its original inspirations and tone. Updated with refreshed visuals, new gamemodes and maps, new weapons, new teams, and a portly oil baron.
Team Fortress 2 Classified has achieved a Player Score of 85, placing it in the #9 spot for the best free Moddable games. Its score was calculated by analyzing a total of 8,271 reviews on Steam. This breaks down to a total of 7,274 positive reviews and 997 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 Team Fortress 2 Classified on the Steam Deck (though some functionality may be limited).
10. Space Aces
Space Aces is an indie space shooter that plunges you into an online universe full of action, strategy, and fierce competition. Step into the cockpit and evolve from a rookie pilot into the most feared Ace in the galaxy!
Space Aces has achieved a Player Score of 62, placing it in the #10 spot for the best free Moddable games. Its score was calculated by analyzing a total of 305 reviews on Steam. This breaks down to a total of 196 positive reviews and 109 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Space Aces on the Steam Deck (though some functionality may be limited).
| Release Date | 1/2/2026 |
| Developer | DewEnforcer |
| Publisher | Space Aces |
| Steam App Id | 4220440 |
More Free Moddable Games
Explore even more rankings for the 100 best free Moddable games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 738,118 | 8/21/2012 | 86 | Free | Steam Charts | |
| 21,858 | 5/16/2020 | 96 | Free | Steam Charts | |
| 8,335 | 4/24/2015 | 95 | Free | Steam Charts | |
| 6,714 | 8/14/2023 | 96 | Free | Steam Charts | |
| 2,134 | 10/15/2020 | 84 | Free | Steam Charts | |
| 932 | 8/17/2020 | 87 | Free | Steam Charts | |
| 873 | 2/14/2012 | 89 | Free | Steam Charts | |
| 650 | 7/10/2012 | 91 | Free | Steam Charts | |
| 501 | 1/30/2026 | 85 | Free | Steam Charts | |
| 366 | 1/2/2026 | 62 | Free | Steam Charts | |
 | 356 | 4/1/2021 | 94 | Free | Steam Charts | |
 | 301 | 5/6/2021 | 88 | Free | Steam Charts | |
 | 269 | 1/22/2016 | 92 | Free | Steam Charts | |
 | 215 | 11/17/2021 | 67 | Free | Steam Charts | |
 | 188 | 1/27/2026 | 85 | Free | Steam Charts | |
 | 178 | 4/20/2017 | 93 | Free | Steam Charts | |
 | 171 | 4/14/2023 | 93 | Free | Steam Charts | |
 | 142 | 6/14/2024 | 94 | Free | Steam Charts | |
 | 138 | 4/30/2015 | 76 | Free | Steam Charts | |
 | 106 | 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, March 13). Steam Store. Steam Store.
- Valve Corporation. (2026, March 13). Counter-Strike 2 on Steam. Steam Store.
- Valve Corporation. (2026, March 7). tModLoader on Steam. Steam Store.
- Valve Corporation. (2026, March 16). Blender on Steam. Steam Store.
- Valve Corporation. (2026, March 13). VPet-Simulator on Steam. Steam Store.
- Valve Corporation. (2026, March 13). Age of Empires III: Definitive Edition on Steam. Steam Store.
- Valve Corporation. (2026, March 15). DDNet on Steam. Steam Store.
- Valve Corporation. (2026, March 11). Crusader Kings II on Steam. Steam Store.
- Valve Corporation. (2026, March 14). Source Filmmaker on Steam. Steam Store.
- Valve Corporation. (2026, March 16). Team Fortress 2 Classified on Steam. Steam Store.
- Valve Corporation. (2026, March 9). Space Aces on Steam. Steam Store.