IGAAP cooperates with the following organizations and individuals:

• Heim Theory Research Group
  
  The German physicist Burkhard Heim was severely handicapped and therefore it was impossible for him to work in a team at an institute. Nevertheless, in 1954, he privately performed the difficult calculations for Einstein’s Unified Field Theory and fulfilled Einstein’s dream after decades of lonely work: a complete geometrical description of all forces and a formula for the masses of all elementary particles. Heim Theory Research Group attempts to call other physicists’ attention to this theory by suitable presentations of Heim’s works. (Link: Heim Theory and the UFO Phenomenon)

• NARCAP USA
  
  The National Aviation Reporting Center on Anomalous Phenomena was founded in 1999 by renowned American UFO phenomenon researcher Richard F. Haines and cooperates with various organizations worldwide. For more than 80 years pilots and air traffic controllers have been reporting on sightings and radar surveys of unidentifiable aerial phenomena (UAP). The aviation authorities in the US show no interest in these incidents. The aim of NARCAP USA is therefore to analyze dangerous encounters with unidentifiable phenomena in the airspace and to improve flight safety. An example of such an analysis is the incident over Chicago's O'Hare International Airport: Report of an Unidentified Aerial Phenomenon and ist Safety Implications at O’Hare International Airport on November 7, 2006 (PDF-download).

• NARCAP Germany
  
  NARCAP Germany was founded in 2011 as a branch of NARCAP USA and has emerged from the former "Working Group Pilot Sightings" of MUFON-CES (Central European Section). NARCAP Germany is a working group of experts from various fields including aviation, engineering, science and administration.

• SOBEPS
  
  The Société Belge d'Etude des Phénomènes Spatiaux (since 2007 called COBEPS - Comité Belge d'Etude des Phénomènes Spatiaux) became known through the comprehensive investigation of the Belgian UFO Wave which occurred between 1989 and 1991. Today the main objective of COBEPS is to analyze current sightings from Belgium and to continue the research on the Belgian UFO Wave - especially on the sightings on the evening of November 29, 1989.

• Project 1947
  
  Project 1947 is a world-wide effort to document the origins of the modern UFO phenomenon. Research for the project has yielded many early-era UFO reports via the Freedom of Information Act (FOIA), newspaper articles and contemporary accounts. Project 1947 was initiated by renowned US-American UFO researcher Jan L. Aldrich. In 1996, with the assistance of America On Line and fellow researchers, he created Project 1947 as a private E-mail computer network to share and to encourage serious UFO research worldwide.

• Robert Hastings
  
  For more than 40 years, noted American researcher Robert Hastings has sought out former and retired US Air Force personnel regarding their direct or indirect involvement in nuclear weapons-related UFO incidents. These individuals - ranging from retired colonels to former airmen - report extraordinary encounters over nuclear facilities in the US and elsewhere. To date, Hastings has interviewed more than 150 military veterans who were involved in various UFO-related incidents at US missile sites, weapons storage facilities, and nuclear bomb test ranges. Robert Hastings’ book, UFOs and Nukes: Extraordinary Encounters at Nuclear Weapons Sites, has been revised and updated in 2017 and is considered one of the most important publications in the UFO field.