Not sure if you have tried the Advanced Search feature of the webtools, but just in case you have not....
Webtools, Item, hit Advanced Search.
Item Type-->Augmentation
Scroll down to the first Stat box-->Fits in Aug Slot
Is-->= (the equal sign)
Stat Value-->6
Then hit the Search button at the bottom of the page. This will give you like 10 pages of augs that can fit in slot type 6. Unfortunately, half those augs are unavailable to us because they are either not offered anymore, never were offered, or are for GMs.
Far as I know, type 6 is used for items that go in the charm slot of our armor. So if you fill in the Slot blank next to the Item Type blank back at the top of Advanced Search with Charm, that huge list whittles down to two pages.
When you look at that two page list, then again you see that some of the hits are not available to us. But...
Blighted Trinket - I'm gonna take a guess and say this drops in DeepScar.
Charm of the Vampire - judging by its item number, I am going to guess that it drops in Deepscar.
Charming Liquid - Sleeper's Tomb aug. See wiki.
Charming Wind - Plane of Air aug. See wiki.
Marshmallow augs - drops in Runnyeye during Halloween event.
Gem of... - donor augs that are not available to us anymore. Here is a post about them:
http://www.thehiddenforest.org/forum/viewtopic.php?f=30&t=15282&p=88614&hilit=gem+of+immortal#p88614Glowing/Radiant Trinket - HoH augs., they can be created by turn-ins or directly dropped by bosses. See the wiki page for HoH.
GM... - you have to marry Lillu's daughter to get one of these.
Leaf - donor aug.
Livi's - drops from a couple mini-bosses in CoTW.
Noble's - drops from Names/mini-bosses in NC.
The others I don't know about. But perhaps this is a good time to ask Lillu...
Hey Lillu, can you tell us about:
1)Adventurer's Stone (item 41000)?
2)Icy Orb of Tranquility (item 68127)?
3)Slipgear's Gem (item 51683)?
4)Wayfarer's Brotherhood Emblem (item 40999)?