a) video hosting with cc license, downloadable
www.archive.org
www.blip.tv
www.engagemedia.org
www.vimeo.com (downloading software needed)
b) sound and music (free and downloable, cc licensed)
www.freesound.org
www.opsound.org/index.php
www.cashmusic.org
www.djspooky.com/sounds.html
www.magnatune.com/
www.creativecommons.org/legalmusicforvideos
www.beatpick.com/index.php (commercial use cc)
c) ripping、file conversion
dvd ripping
http://handbrake.fr/
file conversion of almost any format
http://www.zamzar.com/
online youtube downloader
http://vixy.net/
online youtube downloader
http://www.vconversion.com/
d) screencasting
cam-studio
http://camstudio.org/
workshop 2009 