OmegaT - OmegaT is a free open-source translation memory application for professional translators written in Java.
Unity - The multiplatform game creation tools for everyone.
Crowdin - Localize your product in a seamless way
Godot Engine - Feature-packed 2D and 3D open source game engine.
Transifex - Transifex makes it easy to collect, translate and deliver digital content, web and mobile apps in multiple languages. Localization for agile teams.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.