This is for crafting only, but it will help you manage your inventory and allows you to link recipes to other players.
(Note for Devs: Please reduce the chat silence. Every time I link a recipe to someone from this addon I'm silenced for seven seconds.)
Basically, you put all your raw materials in inventory and stand by a trade vendor. You have enough to make five of an item, and you put them in queue. Then you open up the trade vendor and ATW will ask you if you want to buy the thread, coal, flux, dye, etc that is needed. You hit the button - Bam! It buys exactly the amount you will need to craft the five items. While you're crafting those five items, you can also queue up other things to create. This addon is amazing just for inventory management, you don't end up with stacks of leftover trade supplies in your bank.
The downside is it has bugs. If you're on a character that does not have a crafting ability you will have to disable ATW or you'll keep getting alerts.
http://addons.us.to/addon/advancedtradeskillwindow