CSClock is described as 'An open source C# application which keeps track of the time you spend on your computer, by setting limits. It will then alert you when your computer time is out'. There are four alternatives to CSClock for a variety of platforms, including Android, Windows, Android Tablet, iPad and iPhone. The best alternative is Qustodio. It's not free, so if you're looking for a free alternative, you could try ESET Parental Control. Other great apps like CSClock are Salfeld Child Control (Paid) and Titan Family Security (Paid).