Nagger can prevent eye strain and stay healthy, is for persuading you to take regular breaks from the computer, as recommended by Health and Safety guidelines.
It assumes some level of responsibility, so attempts to cheat and bypass the rest periods are discouraged as opposed to prevented. It is not suitable for unattended parental control use. Get Nagger and take it for a spin to see what it can actually do for you!

The license of this software is Freeware, you can free download and free use this desktop reminder software.