parental control internet time

Where I can find a parental control software to download?
I installed Internet for the first time in my house and I'd find reliable software to download the parents until I buy one. Please, recommendations and sites. So I would appreciate if you give me the names of the best parental control software is to buy. Thank you.
Hello! This is a good question! I bet there are many parents, many out there doing the same. Some of us have found solutions well, but depending on how "smart" children are, may be easy to get … must be very strong in execution. One of them is security of the Microsoft family. It's still in beta, but I felt very good. You can control the sites their children can access, and you can even talk that through MSN Messenger. To start a site security of the family rate can not (and block), can send a "request permission" via email you can answer any any computer with Internet access. A disadvantage is that if some of your children come to know his password, he was convicted because do not have free access to anything. The others I've used the AOL parental controls. This is more difficult because it also blocks Internet usage time. You can, for example, define when the Internet service should go to each of their children, and even software that can be used to connect to the Internet. It's a little complicated, but the good thing is you can control when children no longer have to be online. As First, it is also password protected. So make sure you never guess password. Hope this helps.
Child internet time limit software: Introduction to GroundHog from Mediavention.com