ShardKeeper is a simple addon which does pretty much the same as other shard tossing addons.
It lets you set a limit to how many shards you keep with the slash command:
(Example : To set the shard limit to 15)
ShardKeeper will confirm the new limit is set.
The icon is movable with the left mouse button and with a click from the right mouse button it will toss 1 shard at a time if you need space.
Oh and it will tell you how many shards you have in your inventory.
Simple stuff really, was made for my wife who wanted a simple shard controlling addon with the option to quickly toss a few shards out the bag quick and easy.
local playerClass, englishClass = UnitClass("player");
if englishClass == "WARLOCK" then
-- rest of the code here