1)   ComputerTime 1.0
Allows parents to set limits on the amount of time and time of day when children can use the computer. Use it to ensure children don't stay up past bedtime on a school night chatting online, and make sure homework is getting done. Try it for free!

 2)   Child Control 2005 7.153
The most optimal parental control for all Windows-PCs (incl. XP). Set time limits for the PC and/or the Internet and block/filter unwanted Internet contents. Limit access to internal Windows components and personal folders.

 3)   PC-Time Manager 1.2
PC-Time Manager is considered a parental control software that limits computer time through creating time schedules for each windows user. If you kids are over using the computer, you can now create computer schedules to solve the problem.

 4)   Pre-Book PC Reservation Client (Windows) 1.0
An Open Source time limit management and PC reservation client that retrieves remaining time from a server based on the user's login information. A count down clock shows remaining time and logs the users out automatically once their time is up.

 5)   Child Control 2005 7.153
The most optimal parental control for all Windows-PCs (incl. XP). Set time limits for the PC and/or the Internet and block/filter unwanted Internet contents. Limit access to internal Windows components and personal folders.