The "Black Projects" are governmental projects that are considered technological secrets. These can range from laser and particle beams to top secret aircraft.

Project Blue Team

Country : USA
Start :
End : merged with Sign
Scope : Recovery of crashed alien crafts
Location:
Responsible : Air Force

Project Sign

Country : USA
Start : 1947
End : absorbed by Grudge
Scope : Evaluation of the alien threat to national security
Location:
Responsible : Air Force /CIA

Project Grudge / Aquarius

Country : USA
Start : 1949
End : Absorbed by Blue Book in 1952 then declassified on July 23, 1997
Scope : collect all scientific, technological, medical and intelligence information from UFO/IAC          sightings and contacts with alien life forms. Out of 12,618 UFO reports investigated, only 701 UFO remained unexplained. On April 25, 1964, a USAF intelligence officer met two aliens     at a pre-arranged location in the desert in New Mexico.
Location:  Area 51
Responsible : US Air Force / NSA / CIA / NASA

Project Blue Book

Country :USA
Start : 1952
End : 1969
Scope : demystifying the rumors on aliens / UFO
Location:
Responsible : CIA / US Air Force - Captain Edward J. Ruppelt

Project Moon Dust & Blue Fly

Country :USA
Start :
End :
Scope : investigations of reliably reported unidentified flying objects within the United States. Then location, recovery, and delivery of  descended foreign space vehicles.
Location:
Responsible :  US Air Force / CIA

Project RedLight

Country : USA
Start :
End : absorbed by Snowbird
Scope : build a craft using conventional technology to cover up and explain the  accidental sightings or disclosure of Redlight secret information.
Location: Tonopah test range then Area 51
Responsible : Air Force

Project Snowbird

Country : USA
Start : 1972
End :
Scope : research and test-fly a recovered alien spacecraft.
Location:
Responsible : 

Project Magnet

Country : Canada
Start : 1950
End :
Scope : research and test-fly a recovered alien spacecraft.
Location: Shirleys Bay, Ontario
Responsible : 

Project Aurora

Country : USA
Start : 1987
End :
Scope : building of hypersonic stealth aircraft that can fly Mach 6. This craft has been seen by many observers and flying with several F-117 stealth aircraft. It is reported as "A triangular-shaped, quiet aircraft".
Location: Area 51
Responsible :  US Air Force

Project Plato

Country : USA
Start : End :
Scope : Diplomatic relations with aliens. 
Location: Area 51
Responsible : 

Project Pounce / Pluto

Country : USA
Start : End :
Scope : evaluate all data pertaining to alien technology
Location:
Responsible : 

Project Excalibur

Country : USA
Start : End :
Scope : Building a missile that would destroy  the existing alien underground bases and any future underground bases the aliens might construct.   It would be capable of penetrating 1000 meters of Tuff/hard packed soil such as that found in New Mexico with no operational damage. Missile apogee not to exceed 30,000 feet AGL and impact must not deviate in excess of 50 meters from designated target. The device will carry a 1 megaton nuclear
Location:  Los Alamos, New Mexico
Responsible : 

Project Luna

Country : USA
Start :
Scope : Investigating the alien underground facilities on the dark side of the Moon
Location:  Area 51
Responsible : 

Project Gabriel / Joshua

Country : USA
Start :
End :
Scope : Develop a low frequency pulsed sound generator to neutralize alien weapons
Location: 
Responsible :