Github repo for the MIT RFID ring kit. Includes greyprints for fabbing your own rings.
An open source set of libraries and tools written in Python for interacting with RFID and NFC chips.
A brief synopsis on the construction of a weapon which can fry RFID chips, including those of passports and ID cards. There are no schematics, just a list of the principles used in the design. You'll need knowledge of electronics to make sense of it and apply them in a practical manner.