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. - http://www.lrz-muenchen.de/~heller/NeXT/NeXT.html
NetBSD/next68k - NetBSD port to NeXT hardware and project page. Works on all 68040 non-ADB models. - http://netbsd.org/Ports/next68k/
NeXT Hardware E-Group - NeXT hardware and OS problems and solutions. Low traffic. - http://groups.yahoo.com/group/NeXTUSERS/
Black Hardware Information - Various topics relating to NeXT. - http://www.channelu.com/NeXT/Black/index.html
Black Hole, Inc. - Reseller of NeXT hardware and NeXTSTEP and OpenSTEP software, and Intel-based systems designed for OpenSTEP. - http://www.blackholeinc.com/