The "Apple II Information & Pictorial Reference", featuring detailed information and pictures of all kinds of Apple II hardware, including several rare prototypes and do-it-yourself "hacks". http://www.apple2.org/
A monthly magazine published by the Apple PugetSound Program Library Exchange (A.P.P.L.E.) user group. Site includes back issues, group news and a product catalog with software, books and hardware for sale. http://www.callapple.org/
A free monthly e-zine featuring original articles and the best postings from the Apple II message boards on Delphi and Syndicomm. http://lamp.a2central.com/
Source code, binaries and documentation for NuLib, a program to manipulate the NuFX (ShrinkIt) file archives commonly used on the Apple II. http://www.nulib.com/