From Blumentals Software:
iNet Protector allows you to restrict access to the Web, as well as password protect your Internet connection. iNet Protector will limit your internet access at certain times on demand. You can disable connection completely or limit Internet to work with allowed programs and services only. In order to fully enable Internet access, user defined password must be entered. You can easily schedule Internet availability. Timer allows you to disable Internet connection after specified amount of time.