Google ARCore - Google Augmented Reality SDK
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
8th Wall - Cross-Platform Mobile AR
Pixel Art to CSS - Draw and animate pixel art, export the results to CSS
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.
Pixel Art Studio - A purpose-built drawing tool for pixel artists