http://arpa3.net/anarchy-online/arpa 3- tracks items listed in shopping channels in a categorized view
http://aojunkyard.loftek.net/ao junkyard- tracks shopping channels all on one page, includes icons
http://sourceforge.net/projects/aoia/anarchy online item assistant- allows you to search through all the items you have on all your characters- a MUST for people with a lot of alts (like me).
http://aomaps.com/aomaps.com - the penultimate source for ingame maps. Atlas of rubi-ka and atlas of shadowlands are the best- without question.
http://arpa3.net/ao/clicksaver.htmlclicksaver 3 - automatically rolls missions for you, stopping when it detects that one of the rewards is an item you specify. Makes getting nanos 9000 times easier. Has an archaic interface that takes some getting used to, but does the job, and is essential.
http://arpa3.net/ao/tools.htmlaorc - allows you to use ingame chat channels when your not ingame. of limited use but can be nice to have some times. interestingly whatever way it accesses the chat server allows you to see characters you may've deleted long ago. I use it sometimes to remember the names of old characters that i'd like to re-create.
Human Electrical Transformer