HoloView Simulator lets you first-hand witness HMD field of view issues on a tablet (or any other screen). HoloLens shown in demo, but also available for any HMD (including theoretical ones) — Oculus, Vive, Magic Leap, etc.
FaceShop.io lets you create interactive face filters in a Photoshop-inspired interface, complete with layers, 2.5D space, layer blends and more! It’s also available as a Unity plugin.
Face Mask Designer UV Editor lets you modify UV points on your face mask to make any image a wearable mask (based on Dlib 68 landmark point tracking).
FaceScanPhoto — turns your iPhone X face scan into a new kind of photo memento
HeadText — put text on your iPhone X face mesh
faced.io iPhone X tools for Unity — BlendShapeRecorder and MeshRecorder lets you record blend shapes and mesh animations for testing in Unity
SnapShop and SnapGlass.es — “AR Shopify”