Ludwig is an World of Warcraft item database addon that allows you to search for items ingame in a blink. It runs on all servers and all in-game locales.

It provides a window all items sorted by their proprieties. You can also type items into the chat by typing lw: followed by the item name (e.g., lw:Staff). Once the correct item appears, press tab to automatically convert it into an item link.

/lw or /ludwig - Brings up the search frame.
/lw q <id> - Prints the link of the item with the given ID number.