Our main download location is at Sourceforge. Here you can download the latest specification and the latest software packet for your platform. The firmware folder holds firmware source code for different hardware reference projects.
UiMagician (UI creator) can be downloaded here.
If you want to develop VSCP nodes you can find firmware code and samples here. The Kelvin and the Paris modules are the main reference code for the PIC and you find reference code for other processors in the repository. An alternate hardware framework made by Andreas Merkle is available here