Here is my project called usbXR, an adapter for RFM70/73/75 2.4 GHz RF transceiver: https://github.com/visakhanc/usbXR.
The intention of the project is to communicate with other RFM70 based remote nodes bi-directionally from a PC, for any kind of application.
It features the original HID-Bootloader extended to add a functionality to program remote AVRs over-the-air. The original BootloadHID command line utility is also modified to do self as well as remote over-the-air programming.
Here is a small demo video: https://www.youtube.com/watch?v=0iYNhQ-_6nI