Information and downloads for RadioBlocks from Colorado Micro Devices:

Documentation:
Datasheet
Quick Start Guide
RadioBlocks Bootloading Guide
RadioBlocks Schematic
Simplemesh User Guide
Simplemesh Serial Protocol


Here are links to the source code. I've included zip file downloads in case these links ever get broken.
The Arduino Library:
www.assembla.com/code/radioblock-arduino/git/nodes or zip file

The SimpleMesh C API:
www.assembla.com/code/simplemesh-api/git/nodes or zip file

The Python GUI to connect your PC:
www.assembla.com/code/radioblocks-commander/git/nodes or zip file

The Python GUI Sniffer:
www.assembla.com/code/radioblocks-sniffer/git/nodes or zip file

The SimpleMesh source code:
www.assembla.com/code/SimpleMesh/git/nodes or zip file


Utilities:
Windows 32-bit GCC ARM compiler version 4.8-2013q4.exe
Other versions of the compiler can be downloaded from https://launchpad.net/gcc-arm-embedded

The Python BootLoad tool: lpc111xisp.py (instructions found in ‘RadioBlocks BootLoading Guide’ above)

Windows Sniffer Application

Sniffer Firmware If you have the U2U and JIB boards you can use the Python BootLoad tool to load the image.