Smart Defrag can defragment files, folders, and entire drives as needed or scheduled. It also features SSD trimming to prolong your SDD performance and life. Video walkthrough available. Also part of Advanced SystemCare Free.
Contig is a single-file defragmenter that attempts to make files contiguous on disk. It's perfect for quickly optimizing files that are continuously becoming fragmented, or that you want to ensure are in as few fragments as possible.