Diff Checker - Diff Checker is a free online diff tool that quickly and easily gives you the text differences...
Draftable Compare - Accurate comparisons of PDF, Word, Excel, PowerPoint files
DiffNow - DiffNow lets you compare text files, documents, binary files, and archives up to 1024KB in size.
Beyond Compare - Beyond Compare allows you to compare files and folders.
UltraCompare - UltraCompare is the name of an advanced level of file and folder comparison platform that is loaded with an advanced level of features and functions.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.