Zanaden
Group finder is just a tool that displays other players and their skill level who are looking to do content in groups. It can show what content they want to do, allowing the players to make communication with each other from there on. An example of this is when I log in and want to hunt or kill monsters,I look on the group finder to search for players wanting to do combat/hunt missions at the same skill/level as me. Just a basic feature of what some other games have.
I understand what it generally means. I ask for more specific details. It is not hard to write such tool, I never did because I do not need it myself and I think I have seen such tools in AppZone. Besides, what Ashgan says.
I have no idea what exactly you expect from such tool, because "anyone to train XY level Z" on uni is faster than any tool. Also, such tool must have users, if there will be 10 users and half of them will look for training something totally different than other half... well.. "anyone to train XY level Z" again :) Every app for simple things is too clumsy for case of atys and its player base, imho.
In fact I have been thinking about something with more options, like event app where you can create an event, specify details and let others register, check participants to fulfill requirements or whatever... Using this to call for a plod team is just a detail. But will anyone really use it?