Google ARCore - Google Augmented Reality SDK
Unity - The multiplatform game creation tools for everyone.
8th Wall - Cross-Platform Mobile AR
Godot Engine - Feature-packed 2D and 3D open source game engine.
Wikitude SDK - Wikitude’s all-in-one AR SDK combines 3D tracking technology (SLAM), image recognition and tracking, as well as geo-location for apps.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.