Mac's don't need defragging as OS X automatically writes 2Gb or below sized files to one contiguous space on the drive. There are certain cases where's it's needed to free up a large spaces on the drive, but not something everyone has to do.
Far as other Mac maintainence, there really isn't any except to backup one's files regularly. Keeping Software Updated and run a web browser check to make sure the plug-ins are current.
In researching the best free apps for the Mac, I started by using Apple's category list. This makes it easier to cover the wide variety of content available. If an app is on the Mac App Store, it is in one of the 21 categories that Apple has listed. The 15 Best Mac Apps to Make Everyday Life Easier Apple's macOS is a good operating system, but it's missing some key ingredients. Try these programs to get the most out of your Mac. Mac users have access to a vast selection of excellent photo-editing apps, but even against its many competitors, Pixelmator stands out as one of the best. It boasts a massive list of powerful.
LogMeIn for Mac is one of the most powerful remote desktop apps for Mac users of all abilities and needs. LogMeIn for Mac offers specific tools for individuals, small businesses, IT professionals and help desk technicians and is the best on the market when it comes to enterprise remote desktop support. Affinity Photo is one of the most comprehensive photo editing apps you can get on the Mac. It has professional-quality tools, like advanced color manipulation and 32-bit channel editing.
For Safari and Flash, this check is more accurate
Most of those cleaning programs are junk, especially MacKeeper.
If your friend got onto your computer and visited a bunch of adult sites, then I would recommend something like OnyX, doing ALL the cleaning and maintenance aspects and rebooting, perhaps followed by a Disk Utility Erase free space.
CCleaner beta is out for OS X, used on PC's and combines cleaning and scrubbing of the drive if setup correctly.
If your interested in performance, read my post here
Best Apps For Mac Support Mac
Oct 1, 2011 12:37 AM