The Manta Owners Club
- Offers events, shop, FAQs, a history of the marque, and a forum.
- http://www.mantaclub.org/

Corsa Densetsu R2
- Dedicated to Opel Corsa and Tigra tuning with high quality photographs.
- http://home.tiscali.nl/~pfeddema/

Manta World
- Contains an events diary, picture gallery, list of clubs, and guest book.
- http://www.mantaworld.com/

Opel GT, Wod's Site
- Monthly Calendar, problem discussion, print a wall-calendar or logbook, prospect, 1970s advertising, online video, history, books, video, roadtests, articles, model cars, spare parts, restoration tips, prices, Opel GT clubs, and related links.
- http://www.wods.dk/opelgt/

Ascona A Page
- This site is dedicated to the Opel Ascona A (1970-1975). [Site in German and English.]
- http://www.hacoma.de/ascona-a-page/index.htm

Manta Mad Web Site
- Page about a project Opel Manta and previous cars owned and a message board facility.
- http://www.mantamad.fsnet.co.uk

Opel Ascona Cabrio Place
- Includes owner's gallery, guestbook, download area, and links.
- http://user.tninet.se/~qfi888p/

Opel Astra Enthusists
- Parts, tips, driving information for Opel Astra users from Japan. [Site in Japanese and English.]
- http://www.jade.dti.ne.jp/~fsuzuki/ASTRA/

Opel Motorsport Club
- The Opel Motorsport Club is dedicated to the preservation and appreciation of all German Opels. We operate out of the Los Angeles area, but have chapters across the United States and in Europe, and enjoy official recognition by the factory in Germany.
- http://www.opelclub.com

The official Opel web site
- The official Opel web site
- http://www.opel.com/