Is Alien Technology Already In Use on Earth from since then and now?

From reports, hints, observations, historical research and the like, it would seem that alien technology would include some or all of the following:

• Advanced propulsion systems
• Antigravity
• New metals and alloys
• Energy systems
• Time travel
• Weaponry based on beams of some kind
• Light bending techniques
• Computing techniques
• Some form of teleportation
• Medical compounds / techniques

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