There used to be a product call MacMinder that was written and sold by a husband and wife educational company. I purchased and used it for a number of years and it always worked well keeping my daughter and her friends and guests in line while on the computer. You could restrict access by time of day, user, and particular application. It also tracked status of whole (and or a percentage) that each application was used. You could do reports and see which application was being used the most or was popular.
Unfortunately the company went under and disappeared with no notification or further updates to its registered users. I believe this code last ran on 10.2/10.3 I believe but I have not tried it on any later versions. If anyone on this list wants this code and my registration number and a form that I have transferred it to you then please send me an email.
The current application looks very much the same but not as much functionality from what I read and see. I have no use to download and try it. Maybe this new company has bought the code and is bring the application back under a different name but from the reader comments without alot of functionality as per what I described and charging beta users for upgrades. This is not good user/customer service. Do to these comments, you probably should stay away from this product as it may up costing you more money in the long run even if you try to help them out. They should be ashamed.
Macminder still may be posted on macupdate.