In short

• All armory information as (once) seen on the offical site from Blizzard Entertainment, in game, for all your characters, on all realms
• Information about all skills of your characters, including professions with recipes
• PVP information, including arena teams
• Searchable inventory, including bags, bank, mailbox and auctioned items
• Quest logs and spell books of all your characters
• Searchable achievements and statistics
• Share quests, recipes and character information with other Armory users
• Searchable Guild Bank that updates itself automatically

Please visit CurseForge for a full feature list.

More Information

More detailed information about Armory can be found on CurseForge. Here you can also access the localization tab which provides an interface to make things easier on translators. Additional sofware, like ArmoryGuildRecipes, its XML exporter and a Joomla! web site plug-in, as well as a tool to merge databases from different accounts can be found on the Neighbours Guild Website.

Bug Reports and Feature Requests

The comments are not meant to be used for reporting bugs and feature requests. Especially long stack dumps will clutter up the comments section and make it hard to follow. This may result in your post being unnoticed. Also you have no idea what happened with your post and you will not be able to track its status. The best thing to do in this case is file a ticket.
Filing a ticket is not hard. You can use the same credentials as on other Curse Network websites. Please read How to file tickets before posting.

Coffee

If you like to express your appreciation for the effort that has been put into Armory (and keep me awake to be able to maintain it), press the donate button and buy me a cup of coffee. For those interested: I drink black, extra dark roast. And here you can read how it al started.
For those who did make a donation: thanks, consider yourself as one of the people responsible for keeping Armory alive...