Planetary - Decentralized social media by and for the people.
A360 VIEWER - Free online CAD Viewer
DeSo - DeSo is a new layer-1 blockchain built from the ground up to scale decentralized social applications to one billion users.
STP Viewer - Free STP Viewer - free software that lets you view 3D STEP files (.stp, .step file format).
Manyverse - A social network off the grid
Glovius - Extensible & customizable 3D viewer, for consumption of product design data.