We have the same issue with internal software , our offices are small so we just shout to the office to get out if they are not using it, but yes there is software on the server controlling this.

I would suggest sending out a mail asking people to log out if its not being used or as Nihil said, ask the admin to implement to 10 min afk auto kick feature. This is particulary true for the smokers who leave the apps open and go smoke.