Ever need to ray trace your 3D images in some way that's more interested than slices? Don't want hard surfaces? Wanna do it in a web browser for the world to see? Try Voxeltastic! It's a A WebGL-based Raytraced Voxel Engine with Transparency. If you'd like a brief summary of what the default interface is, please click this link:
The default data set is the wifi signal over a 360mm x 360mm x 180mm area. The density goes from 0 to 255. You can specify the range for what is considered "transparent" to "opaque" along with minor changes to the colors. If you specify Clear to be 0 and Opaque to be 255, areas with poor signal strength will not be visible, and areas with high signal strength will be solid. If you invert these two, then areas with poor signal strength will be solid, while good signal strength will be invisible.
You can play with this data set on the URL listed here: https://cnlohr.github.io/voxeltastic/
Your own data sets!
You can now view your own datasets in-browser. Simply record your data as a packet binary file, with one-byte intensities, or with 4-byte RGBA bytes. Note that all edges MUST be powers of two, i.e. a 32x64x128 block solid.