cSounds.com  
   Info and articles about Csound and Computer Music. Includes Csound Magazine, Catalog, Book and Manual.
   http://www.csounds.com

Csound Manual  
   Available for download or online viewing.
   http://www.lakewoodsound.com/csound/

Spectroscopic Toolkit  
   Open source software in ANSI C that translates quantumphysical data to AIFF file(s). Like CSound.
   http://www.hku.nl/~pieter/SOFT/ST/html

CsoundAV  
   Realtime version of Csound supports audio, MIDI, video, and animated 3D graphics. Successor of DirectCsound.
   http://web.tiscali.it/G-Maldonado

The Alternative Csound Reference Manual  
   Alternative to the official manual. Includes complete working examples. May be more up-to-date in places.
   http://www.kevindumpscore.com/docs/csound-manual/

CSound Magazine  
   News, tips, tutorials.
   http://csounds.com/ezine/

Sy.Mu.S.  
   Composition software using Csound score format, GUI interface. Generative capabilities.
   http://www.luiginegrettilanner.com/HtmlOnePage/indexEn.htm

Csound Editor  
   Flavio Tordini's integrated development environment for Csound.
   http://neoismo.gamersrevolt.com/flavio/csound-editor.html