PureData (also called ‘pd’) is the free, open-source, cross-platform version of MaxMSP, the zeitgeisterrific music and interactive (and visual, if you’re into GEM) software by planetary genius Miller Puckette, among others.
My overview for using pd in the classroom is here.
7/16 update: my Bohlen-Pierce Synthesizer Prototype .
3/15 update: my current PD rig, plus the controller map [novation_oxy_puredata_theRig_v1d ] .
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And, as always, check out my videos! (not done in Pd, sorry . . .)