Source Is The Hot Sauce Of Apex Legends
Apex Legends is the hottest game out right now with the new battle royale shooter from Titanfall developer Respawn Entertainment taking the gaming world by storm. Respawn is wholly owned by EA, and while EA uses its in-house Frostbite engine for its other games like Battlefield, Respawn continued using the Source engine made by Valve for Apex Legends.
Respawn used a highly modified version of the Source engine for Apex Legends, with a bunch of modifications and tweaks that were made for the world of Apex Legends since it's a battle royale shooter.
The developer had to make some adjustments to the engine to handle the much larger map required for the game, as well as the larger draw distances, on a larger map. Source wasn't built for this, so Respawn had to make some surgical changes to get Source working well for Apex Legends.