Source links

http://www.nullsoft.com/free/avs/ - Original License with links to source code since 2010-05-28 available only on http://web.archive.org/web/20100528054327/http://www.nullsoft.com/free/avs/

http://knol.google.com/k/advanced-visualization-studio - quick guide on how to set up (AVS) since May1 2012 available here, forums.winamp.com and http://web.archive.org
http://visbot.net - Nice (AVS) Community publishes allot preset Packs
http://acko.net/design/avs - Steven Wittens personal website
http://www.daandirk.nl/avs - APE's for AVS (http://web.archive.org/web/20081001001634/http://www.daandirk.nl/avs)
http://vjforums.com/showthread.php?t=21854 (archive.org/web/20090717)- Source for AVS and Freeframe

WIKI pages:

Advanced_Visualization_Studio - (AVS)Advanced Visualization Studio what is it. :)
http://dev.winamp.com/wiki/Visual_Developer/ - some descriptions on Winamp (since 2013-12) available on http://web.archive.org

Pack (installer) builder:

http://pimpbot.whyeye.org/  - available at (https://github.com/whyeye/pimpbot)  of course you should before install this http://nsis.sourceforge.net/Download

AVS Releases:

https://visbot.net/avs
http://forums.winamp.com/showthread.php?t=321482 - Cockos Happy AVS
http://forums.winamp.com/showthread.php?p=2905846#post2905846 - avs v2.91 TEST #1