Vuforia SDK - Vuforia is a vision-based augmented reality software platform.
Google ARCore - Google Augmented Reality SDK
8th Wall - Cross-Platform Mobile AR
Wikitude AR SDK - Wikitude AR SDK helps you create breathtaking AR apps to capture the attention of your audience.
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.
ARToolKit - The world's most widely used tracking library for augmented reality.