Eclipse Keyple

https://keyple.org/

=Reference= Eclipse Keyple: the Open Source SDK for access control based on secure contactless technology by Olivier Delcroix, slides video

Discover Calypso, the historical protocol for contactless electronic ticketing and its open source implementation Eclipse Keyple. Used all around the world, it provides high-security solutions for online and offline secure transactions. Calypso is deployed as a transport public ticketing solutions in 125 cities around the world (Paris - Navigo, Grenoble (Oura), Montreal, Lisboa...).