Altoholic is very nice. It allows you to share everything in your bank, guild bank and inventory across accounts. It also allows you to search. For example, I can enter "Runecloth" in the search and see I have 7 in my Main's bags, 3 in the bags of an alt on my main account, 5 in the bags of a toon on another of my accounts and it also lists the recipes that my tailor {also another account} has with "runecloth" in the name.
You can also look at any tradeskill on any toon in your guild, money, talents, guild banks, regular banks, gear, specs, glyphs...pretty much anything. Oh, it'll also tell you when cooldowns are about to expire for things like transmutes and instance locks.
It's not exactly lightweight, and updating can take a while if you're sharing a lot of information {you must share manually, it won't auto-update}. and I don't think there's anything you can do to customize it, but it's a very easy interface to use and has so much information it's kinda daunting.
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