- https://www.n2yo.com/ ⇒ satellite / object tracking
- https://spaceindividuals.com/space-companies ⇒ jobs offered by space companies
- https://space.skyrocket.de/index.html - Gunter’s Space Page
- https://celestrak.org/ ⇒ TLE Data
- https://planet4589.org/ ⇒ Space Cop’s Report (iykyk)