Google Groups' Directory
- Usenet newsgroups and Google Group mailing lists classified by topic, language, region and activity.
- Categorized lists of Usenet newsgroups and Yahoo groups (mailing lists). Links to Google groups and Yahoo groups for web-based browsing of the groups.
Usenet Info Center Launch Pad
- Apparently no longer maintained, but of interest for historical reasons. Besides a list of Usenet newsgroups, also contains links to FAQs, newsgroup descriptions, and other Usenet information.