X Steps Recorder - A clone of Microsoft's Problem Steps Recorder, but for linux.
Google ARCore - Google Augmented Reality SDK
Folge - The fastest tool for creating step-by-step guides.
8th Wall - Cross-Platform Mobile AR
Snagit - Screen Capture Software for Windows and Mac
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.