Hello GrinGEO,
Not sure, if there are any formats that do not require any applications to open them.
In principle you can export textured model to 3D PDF (Adobe Viewer is required to open them), but usually you won't be able to save high-poly mesh or high-resolution texture.
As an alternative, you can use direct uploads or mesh/point clouds to Sketchfab, 4DMapper or PointScene.