> www.calypsonet-asso.org
Calypso users website (Calypso Networks Association), which provides general information about the Calypso teleticketing standard.

> CalypsoTechnology.net
Calypso technical informations, which provides technical information about the Calypso teleticketing standard.

> www.eurosmart.com
European association representing the voice of the smart card industry, Eurosmart promotes and standardizes smart cards and smart card systems.

> www.smartcardalliance.org
The Smart Card Alliance is a US association working to accelerate the widespread acceptance of multiple application smart card technology. This site publishes technical and commercial information about contact and contactless smart cards.

> www.club-contactless.com/
CLUB federates the transport operators sharing their experience in contactless smart card technology.