We have already covered most of the areas where you'd need mods/add-ons; trade skill/profession mods are all that remain now. Here's a list of mods that will help you either level your trade skills, or bring in the big bucks, via your professions...
The basic trade skill User Interface (UI) is really plain and simple; while it's easy to use, it doesn’t offer too many options when queuing up crafts (or anything else for that matter) is concerned.
Advanced Trade Skill Window fixes this by giving you a lot more control over your trade skills, via a kickass UI. It includes everything from a nifty filter function, to a really powerful production feature that even considers crafted reagents (for instance, you could convert Knothide Leather to Heavy Knothide Leather and convert the latter Heavy Knothide Kits in the same queue!)



