About.com: Presents cheat codes and FAQs for over 30 games.
CD-i Utilities: Includes developer friendly downloads and technical information.
Disctronics: CD Interactive: Offers format information including disc standards, video, and audio specifications.
The Black Moon Project: Offers news, guides, reviews, forum, and scans of CD covers, magazines, and game manuals.
The CD-i Collective: Provides tips, tricks, and reviews.
The Ultimate CD-i Players Page: Includes games, hardware and links.