Games like RaceLeague
Games like RaceLeague include BeamNG.drive, Wreckfest, Assetto Corsa, Forza Horizon 5, and Car Mechanic Simulator 2018. We matched them by the tags players give RaceLeague on Steam (Racing, Multiplayer, Realistic, Automobile Sim, and Physics): closest matches first, and among equally close ones the better-known games.

BeamNG.drive
Shared: Realistic · Physics · Driving

Wreckfest
Shared: Racing · Multiplayer · Automobile Sim

Assetto Corsa
Shared: Racing · Multiplayer · Automobile Sim

Forza Horizon 5
Shared: Racing · Multiplayer · Automobile Sim

Car Mechanic Simulator 2018
Shared: Automobile Sim · Multiplayer · Realistic

Brick Rigs
Shared: Multiplayer · Destruction · Physics

Forza Horizon 6
Shared: Racing · Multiplayer · Automobile Sim

CarX Drift Racing Online
Shared: Racing · Multiplayer · Physics

My Summer Car
Shared: Automobile Sim · Realistic · Driving

DiRT Rally 2.0
Shared: Racing · Multiplayer · Automobile Sim

MudRunner
Shared: Multiplayer · Automobile Sim · Realistic

City Car Driving
Shared: Automobile Sim · Realistic · Multiplayer

Assetto Corsa Competizione
Shared: Racing · Multiplayer · Automobile Sim

Garry's Mod
Shared: Multiplayer · Physics · Sandbox

Wreckfest 2
Shared: Racing · Multiplayer · Automobile Sim

Assetto Corsa EVO
Shared: Racing · Automobile Sim · Realistic

Forza Motorsport
Shared: Racing · Multiplayer · Automobile Sim

SnowRunner
Shared: Multiplayer · Automobile Sim · Realistic

Automobilista 2
Shared: Racing · Multiplayer · Automobile Sim

Le Mans Ultimate
Shared: Racing · Multiplayer · Automobile Sim

The Crew™ 2
Shared: Racing · Multiplayer · Automobile Sim

Car Mechanic Simulator 2021
Shared: Realistic · Automobile Sim · Racing

Assetto Corsa Rally
Shared: Racing · Automobile Sim · Physics

FlatOut 2
Shared: Racing · Multiplayer · Automobile Sim