ShopKeep
Addon to simplify the business side of trade skills. Allows prospective customers to search through your available recipes, and the addon will auto-respond with matching recipe links (showing mats etc.). Individually configurable to work on say / guild / party / raid, always enabled for whisper. Requests consist of a keyword "!shop" followed by any search text. Originally written for TBC Classic.
Instructions for use:
The addon scans your recipes anytime you open a profession screen, and saves them in a per-character database that persists between logins. Therefore, upon first installing this, you should open each profession screen at least once before expecting the auto-respond to work.
All types of messages are enabled by default, but can be disabled in the Interface Options screen