FreeWRL is an Open Source, cross platform VRML2 and X3D compliant browser, with script, SAI and EAI support. Platforms supported: Linux and other Unix-style platforms; Mac OS/X; Windows. Support for mobile platforms (iOS, Android, QNX) is under development.
A WebGL-based 3D engine for technical visualization
...Annotations. Cross-section views. Scene object hierarchies. Transform hierarchies. Bounding volumes. 3D picking, raycasting. Screen capture. You can dynamically edit most things in your scene at runtime. Animate your scenes by updating the properties of their components. Load 3D models into your scene from glTF.