Trailmakers is described as 'Build the ultimate vehicle and explore a vast open world filled with challenges and adventure. Play solo or team up with friends in multiplayer to conquer the toughest obstacles. With a thrilling campaign mode and endless creative possibilities, Trailmakers is the ultimate' and is an game in the games category. There are three games similar to Trailmakers for Windows, Steam, SteamOS and Mac. The best Trailmakers alternative is Garry's Mod. It's not free, so if you're looking for a free alternative, you could try s&box.
Garry's Mod is a Sandbox Game based around the idea of building. Unlike most other games there aren't any objectives - you can't lose and you definitely can't win. Doesn't work on MacOS 11.15 or higher.
Garry's Mod is the most popular Windows & Mac alternative to Trailmakers.
Garry's Mod is the most popular commercial alternative to Trailmakers.
Scrap Mechanic is an all-new creative multiplayer sandbox game which drops you right into a world where you quite literally engineer your own adventures! Choose from the 100+ building parts you have at your disposal and create anything from crazy transforming vehicles to a house...
S&box is a platform and game development toolkit developed by Facepunch studio powered by Source 2. Initially, the development was based on Unreal Engine 4, but as soon as Half-Life: Alyx came out, Facepunch immediately requested the engine branch of the newly-published game.
s&box is the most popular Open Source & free alternative to Trailmakers.
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Has the same mechanics as Trailmakers.