Godot Engine - Feature-packed 2D and 3D open source game engine.
Crowdin - Localize your product in a seamless way
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
POEditor - The translation and localization management platform that's easy to use *and* affordable!
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.