I’ve been building Orbital Congestion Simulator for a while now. It shows thousands of satellites and debris around Earth in 3D, using real TLE data from CelesTrak and SGP4 to calculate their positions.

You can filter by orbit, select objects for details, check close approaches, replay historical collisions such as Iridium 33 and Cosmos 2251, and explore a simple Kessler Syndrome future projection. The interface is also available in several languages.

Live demo: https://orbital-congestion-simulator.vercel.app