XBMC related projects and sites

Official XBMC sites

 * XBMC website - http://xbmc.org
 * XBMC wiki - http://wiki.xbmc.org
 * Download - http://xbmc.org/download/
 * Forums - http://forum.xbmc.org - XBMC forums for help and support for both end-users, developers, skinners and graphics-designers, etc
 * IRC / live chat - #xbmc on irc.freenode.org
 * Bug reporting - http://trac.xbmc.org
 * Git repo / source code - https://github.com/xbmc/xbmc
 * Translations - https://www.transifex.net/projects/p/XBMC-Main-Frodo/
 * Donate - http://xbmc.org/contribute/donate/
 * Facebook - http://www.facebook.com/XBMC
 * Google+ - http://plus.google.com/102926840947534443602/posts
 * Twitter - http://twitter.com/xbmc
 * YouTube - http://www.youtube.com/user/teamxbmc
 * OHLOH - https://www.ohloh.net/orgs/xbmc
 * Sourceforge - https://sourceforge.net/projects/xbmc/

Unofficial local XBMC community sites

 * http://xbmc.ru - XBMC Russia (Russian)
 * http://xbmcfreak.nl - XBMC Netherlands (Mainly Dutch)
 * http://xbmcnerds.com - XBMCNerds (German)
 * http://xbmcspain.com - XBMCSPAIN (Spanish)
 * http://xbmcbrasil.net - XBMC Brasil (Portuguese)
 * http://passion-xbmc.org - XBMC Passion (French)

Indirectly XBMC related projects
Open source projects that XBMC depends on (if you help/support or contribute these projects then you indirectly help/support XBMC):
 * FFmpeg - XBMC uses FFmpeg codec suite to decode and view DivX, JPG, etc.
 * libdvdnav - XBMC uses libdvdnav from this project to display/navigate DVD-Video menus
 * libCDIO - XBMC uses this library to read ISO 9660, CDDA and parse CD/DVD images
 * libmpeg2 - XBMC uses the libmpeg2 codec library to decode MPEG 1/2 & VOB
 * libvorbis - XBMC uses the libvorbis codec library to decode OGG audio
 * libmad - XBMC uses the libmad codec library to decode MP3 audio
 * libdca (formaly libdts) - XBMC used the libdca codec library to decode DTS audio in software
 * xiph - XBMC uses the xpih codec library to decode Theora Video (VP3)
 * MikMod - XBMC uses this library from this project to playback Tracker Mod's
 * LZO - XBMC uses the LZO library to compress/decompress XBMC skin textures
 * FiBidi - XBMC uses FriBidi Unicode Bidirectional Algorithm library to flip sibtitles
 * Python - XBMC has a limited ported version of the Python framework for scripts

Old Xbox stuff

 * http://xbmc4xbox.org.uk - For continued support of XBMC for Xbox
 * Xbox-Scene.com's XBMC-community-forums - help and support forum