Top 5 Free Computer Maintenance Tools You Should Know About. Next to refusal to use two step authentication, and failure to image and backup drives, lack of computer maintenance is my pet peeve. As the family and friend computer guy, I spend a lot of time fixing systems for friends and family who don't use the most basic security and safety techniques. This list of free maintenance tools should be on every computer. My favorites are CCleaner and Malwarebytes. There is no excuse for failing to maintain your computer. Friends and family, are you listening? Would you fail to maintain the car you ride around in? Stupid question. Of course, I have spoiled you by making myself available to fix problems. It's a dirty job; but, somebody has to do it.