Gamma Group makes Intrusion, Phone Monitoring, Internet Monitoring, Monitoring Centre, Analysis, Audio Surveillance, Video Surveillance, Counter-Surveillance, Equipment, Monitoring Centres, Communications Monitoring, and Technical Surveillance technology. Their headquarters is in Andover. They have offices in United Kingdom.

Narus makes Internet Monitoring technology. Their headquarters is in Sunnyvale. They have offices in United States of America.

Micro Systemation makes Phone Monitoring and Analysis technology. Their headquarters is in Stockholm. They have offices in Sweden.

Hacking Team makes Intrusion technology. Their headquarters is in Milan. They have offices in Italy.

Trovicor makes Monitoring Centre and Monitoring Centres technology. Their headquarters is in Munich. They have offices in Germany.