MUFON – Mutual UFO Network
The organizers of this website investigate UFO sightings and, most importantly, collect the data into a worldwide UFO sighting database. Do you want to know whether there have been UFOs spotted in your home town? The Live UFO Map allows you to find out.
NUFORC – National UFO Reporting Center
This is another UFO reporting database. While it doesn’t have the cool map that MUFON does, you can still search the database by location, date and/or shape, and the reports are a bit more personalized.