Eclipse Keyple

https://keyple.org/

=Reference= Eclipse Keyple: the Open Source SDK for access control based on secure contactless technology by Olivier Delcroix, https://wiki.eclipse.org/images/3/38/EclipseIoTDayGrenoble2019-Keyple.pdf.

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...).