Excel Compare

Track differences and compare Microsoft Excel files and spreadsheets
PDF Compare

compare pdf files side-by-side, show the changes and differences between the two
SizeExplorer Pro

powerful disk space usage analyzer with folder size, charts and clickable report

2 Texts Compare - most powerful file comparison software
Sync Assistant

Compares two directories or directory trees and assist with file alignment.

Beyond Compare is a file compare and directory sync utility wrapped in one.
PilotEdit x64

pilotedit is a powerful file editor capable of opening files larger than 400gb.

Very easy to use and powerful folder compare, synchronize and backup utility.
FileAnt

tabbed file manager, ftp client, pie chart, advanced tools, and file viewer
PilotEdit Lite

an amazing file editor capable of editing large files