Software Per l'Audio Editing e la Composizione Musicale:

Documentazione e Manuali On-line (ancora in Inglese): 

CLMS Manuals useful on-line material for various SWSS languages, MIDI software & hardware, and synthesis methods
Cmix
Common LISP Music
Csound (tarred & gzipped here)
Digital Soundshapes: Einfuehrung in die Theorie und Praxis der Klangsynthese an excellent online introduction to the theory and practice of digital sound synthesis (mostly in German but with some sections in English) 
Nyquist
RTcmix Documentation an updated collection from Luke Dubois, includes new tutorials and examples 
Sound, Synthesis, and Audio Reproduction "an introduction to modern sound systems, human hearing, sound synthesis and processing and related topics" from Sampo Syreeni
PD is a new MAX-like language from Miller Puckette, Linux version by Guenter Geiger
The PLUM Page Tim Thompson's on-line list of programming languages used for music
Quasimodo "a modular, extensible, real-time synth for Linux and related operating systems", an ambitious project from Paul Barton-Davis
(RT)cmix is a version of Cmix maintained by Dave Topper
Rusty is a design spec for "a comprehensive computer system for musical composition" which will include a GUI similar to a modular synth
SAOL is the MPEG-4 Structured Audio Orchestra Language from Eric Scheirer
MPEG-4 Structured Audio: Developer Tools a page from John Lazzaro and John Wawrzynek
Sapphire is by Jim Finnis; a Sapphire FAQ is available here
Shroom Town an interactive sound-processing page from composer Eric Lyon
SMS comes from Xavier Serra; a very cool on-line GUI is located here

Sintetizzatori e Campionatori: