I recently downloaded and started playing with Pd (written by Miller S. Puckette, the same chap who started Max/MSP).
For reference, these are some good sites to learn about Pd and download loads of goodies to extend its functionality:
- The community-run Pd portal
- py/pyext: Python script objects (for MSP too)
- GridFlow A Multidimensional dataflow processing library for PureData and Ruby, designed for interactive multimedia (non-Win32 at the moment)
- Hans’ site
- The Webring
- The Graphical Interface for Pure Data allows one to create a front end to a Pd patch
I am in the process of creating a Visual Studio 2005 VC project/solution to supersede the antiquated command-line based Makefile compilation process. I hope this will draw more people to extending Pd and creating new/contributing to existing externals in a friendlier development environment!