Black Hole, Inc.
Reseller of NeXT hardware and NeXTSTEP and OpenSTEP software, and Intel-based systems designed for OpenSTEP.

Black Hardware Information
Various topics relating to NeXT.

TjL's NeXTStep/OpenStep Site
Devoted to NeXTStep and OpenStep information, FAQs, and software reviews.

The Peanuts-Archive's
FAQ: Black (NeXT) hardware. A classic resource for all of the most commonly-asked NeXT hardware questions.

NeXT Hardware E-Group
NeXT hardware and OS problems and solutions. Low traffic.

The NeXT Information Archive
A repository for information on NeXTSTEP, OpenSTEP and Rhapsody. Many pictures and scans.

NetBSD/next68k
NetBSD port to NeXT hardware and project page. Works on all 68040 non-ADB models.

Heller's NeXT pages
A useful collection of information for working with and around NeXT boxes. Includes many FAQs, schematics and some interesting power supply fixes.