The Synthesis ToolKit in C++ (STK)

The RtAudio WWW site
The RtMidi WWW site
MoMu-Stk: A lightly modified version of STK that supports the iPhone platform (iPhone, iPad, iPod Touches)
StkX: A Cocoa STK Framework for Mac OS X by Woon Seung Yeo
Mobile STK: A port of STK for mobile devices by Georg Essl and Michael Rohs
ChucK: Concurrent, On-the-fly Audio Programming Language using STK unit generators
Kern Scores: A Library of Electronic Musical Scores (with automatic conversion to SKINI format)
MIDI to SKINI file converter by Craig Sapp
Kern Score to SKINI file converter by Craig Sapp
PeRColate: A Port of STK for Max/MSP
AUStk: a demo of integration of STK instruments into an AudioUnit by Airy Andre