The best alternatives to War Tortoise are Stadia, Epic Games, and RAWG. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
A curated digital storefront for PC and Mac, designed with both players and creators in mind. Focusing on great games and a fair deal for game developers.