
Freeware: IOBit Smart Defrag
Replaces: Diskeeper
You save: $30
There's no shortage of well-rounded defragmentation applications, but IOBit Smart Defrag runs circles around them. Its built-in tool persistently defragments your most-used files without gumming up your system. Like Diskeeper, you can set it to run during idle moments, and its performance is steady enough to run on older and more resource-scant machines. Smart Defrag's scheduler also lets you plan late-night defragging, and can shut down the computer when it's done.
Photo credit: CNET