SCI: Sierra's Next Step - Article about the Sierra Creative Interpreter by Just Adventure magazine editor Randy Sluganski. - http://www.justadventure.com/articles/Engines/SCI/SCI.shtm
FreeSCI - a GNU GPL project make SCI games playable across platforms - http://freesci.linuxgames.com/
SCI Studio - Free, complete SCI game development system, and demo of SCI Studio VGA. - http://www.bripro.com/scistudio/