tikitag
For years we have been anticipating the day when RFID tags would be ubiquitous, with Tiktag we can now began writing and reading our own tags. It's so simple even a dog could tag his owner, or a child a house at Holloween to inform the other kids with an NFC enabled phone of the trick or treats.
Getting started with tikitag is easy, just create an account then order the RFID Smart Card Reader with 25 tags. Download the software and go to the dashboard to begin making your first tikitag