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NFCProxy is a an Android app that lets you proxy transactions between an RFID credit card and a reader. The saved transactions can be replayed to skim credit cards or the RFID credit card can be replayed at a POS terminal.
NFCProxy can also be useful for protocol analysis to learn about the underlying communication protocol.
In order to replay credit cards to a reader you MUST install a special version of CyanogenMod. See Wiki.
Slides from the Defcon 20 presentation of NFCproxy can...
Singularity is a suite of RFID Middleware to support RFID enabled Supply Chain Management, integration to the enterprise, and EPCglobal. It includes edge services for device management, event filtering, workflow, as well as integration components.
BTnodeRFID provides a mobile RFID reader for the ISO 15693 RFID standard with a Bluetooth interface based on existing hardware components. Software libraries to access the reader for J2SE, J2ME and Symbian platforms are included.