Hello!
Many of us participate in ACM-like team contests. And many of these use Codeforces::Gym.
It's often hard to find a contest which is new to each team member. So I made a little tool which shows a list of contests that satisfy condition: for each team member there is no submission to a contest.
Hope it will be useful: http://cftoolkit.nic11.ru/gym_not_solved