- Wikipedia: The Hitchhiker's Guide to the Galaxy
 - Information about radio, book, television, and film versions of The Hitchhiker's Guide to the Galaxy, including plot overview. - ZZ9 Plural Z Alpha
- Hitchhiker's Guide to the Galaxy Appreciation Society. Includes information about membership and the Mostly Harmless quarterly magazine.
- Vogon Heavy Industries
- Includes an online Hitchhiker's Guide to the Galaxy.
- Project Galactic Guide
- Spoof encyclopedia meant to guide and misguide its readers in matters of life, death, and finding a parking space anywhere in the Universe, in the style of the Hitchhiker's Guide to the Galaxy.
- h2g2
- Official home of the Earth Edition of The Hitchhiker's Guide to the Galaxy. Offers an unconventional guide to life, the universe, and everything.
- BBC Radio 4: The Hitchhiker's Guide to the Galaxy
- BBC site for re-creation of The Hitchhiker's Guide to the Galaxy radio programme, twenty-five years after its first broadcast, brought to life in the original medium with the (mainly) original cast.
- Marvin the Paranoid Android
- Homage to the largest brain.
- The Hitchhiker's Guide Project
- Complete repository of characters, planets, and other hoopy froods that appear in the Hitchhiker's Guide to the Galaxy books.
- Magrathea
- MUD loosely based on Douglas Adams' Hitchiker's Guide trilogy.
- Rupert
- MOO based upon the Universe as described by Douglas Adams' Hitchhiker's Guide. Accessible either by web or through telnet.
- Ford Prefect Worship Page
- Links, material, ideas.
- Real Hitchhiker's Guide to the Galaxy
- Information about a computer-based encyclopedia with thousands of humourous entries.
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