Apparently no longer maintained, but of interest for historical reasons.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.

Browse or search this hierarchical topic list of Usenet newsgroups. Does not provide access to newsgroups.

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 newsgroups and Google Group mailing lists classified by topic, language, region and activity.