Gatherer keeps track of things that can be gathered in the gameworld, like mining nodes, herbs, chests etc. These are marked on the maps in game. You can also set option to send any gathering info to the guild and/or group, and you'll also receive info from others in the guild that has Gatherer installed.

You can even click items you see even if you don't have the skill to collect it, like mining nodes and herbs. They'll still be stored in the database and sent to guild.

You can set which items should show on the maps, so if you're a herbalists you'll only see herbs, for example.

The database can be sent and shared with other players as well.